diff --git a/ChangeLog b/ChangeLog
index cb3433450d..25757e2b4c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -25,7 +25,9 @@ phpMyAdmin - ChangeLog
 - issue #14633 Use Sass instead of PHP to compile CSS
 - issue #14053 Fix missed padding on query results
 
-4.8.4 (not yet released)
+4.8.5 (not yet released)
+
+4.8.4 (2018-12-11)
 - issue #14452 Remove hash param in edit query URL
 - issue #14295 Issue in Changing theme
 - issue #13267 Ensure that database names with '.' are handled properly when DisableIS is true
@@ -44,6 +46,9 @@ phpMyAdmin - ChangeLog
 - issue #13032 Fix designer errors when database contains special chars
 - issue #14352 Fix designer javascript errors
 - issue #14764 Fix left/right icons hidden
+- issue        [security] Local file inclusion flaw in the Transformation feature (PMASA-2018-6)
+- issue        [security] Multiple CSRF/XSRF vulnerabilities (PMASA-2018-7)
+- issue        [security] XSS vulnerability in the navigation tree (PMASA-2018-8)
 
 4.8.3 (2018-08-22)
 - issue #14314 Error when naming a database '0'
diff --git a/ajax.php b/ajax.php
index f0c8f74877..2816d72734 100644
--- a/ajax.php
+++ b/ajax.php
@@ -28,19 +28,19 @@ switch ($_POST['type']) {
         break;
     case 'list-tables':
         Util::checkParameters(['db'], true);
-        $response->addJSON('tables', $GLOBALS['dbi']->getTables($_REQUEST['db']));
+        $response->addJSON('tables', $GLOBALS['dbi']->getTables($_POST['db']));
         break;
     case 'list-columns':
         Util::checkParameters(['db', 'table'], true);
-        $response->addJSON('columns', $GLOBALS['dbi']->getColumnNames($_REQUEST['db'], $_REQUEST['table']));
+        $response->addJSON('columns', $GLOBALS['dbi']->getColumnNames($_POST['db'], $_POST['table']));
         break;
     case 'config-get':
         Util::checkParameters(['key'], true);
-        $response->addJSON('value', $GLOBALS['PMA_Config']->get($_REQUEST['key']));
+        $response->addJSON('value', $GLOBALS['PMA_Config']->get($_POST['key']));
         break;
     case 'config-set':
         Util::checkParameters(['key', 'value'], true);
-        $result = $GLOBALS['PMA_Config']->setUserValue(null, $_REQUEST['key'], json_decode($_REQUEST['value']));
+        $result = $GLOBALS['PMA_Config']->setUserValue(null, $_POST['key'], json_decode($_POST['value']));
         if ($result !== true) {
             $response = Response::getInstance();
             $response->setRequestStatus(false);
diff --git a/browse_foreigners.php b/browse_foreigners.php
index 6da290d503..2a4376de42 100644
--- a/browse_foreigners.php
+++ b/browse_foreigners.php
@@ -15,7 +15,7 @@ use PhpMyAdmin\Util;
 require_once 'libraries/common.inc.php';
 
 /**
- * Sets globals from $_REQUEST
+ * Sets globals from $_POST
  */
 $request_params = [
     'data',
@@ -23,8 +23,8 @@ $request_params = [
 ];
 
 foreach ($request_params as $one_request_param) {
-    if (isset($_REQUEST[$one_request_param])) {
-        $GLOBALS[$one_request_param] = $_REQUEST[$one_request_param];
+    if (isset($_POST[$one_request_param])) {
+        $GLOBALS[$one_request_param] = $_POST[$one_request_param];
     }
 }
 
@@ -50,15 +50,15 @@ $browseForeigners = new BrowseForeigners(
     $GLOBALS['pmaThemeImage']
 );
 $foreign_limit = $browseForeigners->getForeignLimit(
-    isset($_REQUEST['foreign_showAll']) ? $_REQUEST['foreign_showAll'] : null
+    isset($_POST['foreign_showAll']) ? $_POST['foreign_showAll'] : null
 );
 
 $foreignData = $relation->getForeignData(
     $foreigners,
-    $_REQUEST['field'],
+    $_POST['field'],
     true,
-    isset($_REQUEST['foreign_filter'])
-    ? $_REQUEST['foreign_filter']
+    isset($_POST['foreign_filter'])
+    ? $_POST['foreign_filter']
     : '',
     isset($foreign_limit) ? $foreign_limit : null,
     true // for getting value in $foreignData['the_total']
@@ -68,7 +68,7 @@ $foreignData = $relation->getForeignData(
 $html = $browseForeigners->getHtmlForRelationalFieldSelection(
     $db,
     $table,
-    $_REQUEST['field'],
+    $_POST['field'],
     $foreignData,
     isset($fieldkey) ? $fieldkey : '',
     isset($data) ? $data : ''
diff --git a/chk_rel.php b/chk_rel.php
index cd625fff32..80002acdb7 100644
--- a/chk_rel.php
+++ b/chk_rel.php
@@ -15,20 +15,20 @@ require_once 'libraries/common.inc.php';
 $relation = new Relation($GLOBALS['dbi']);
 
 // If request for creating the pmadb
-if (isset($_REQUEST['create_pmadb'])) {
+if (isset($_POST['create_pmadb'])) {
     if ($relation->createPmaDatabase()) {
         $relation->fixPmaTables('phpmyadmin');
     }
 }
 
 // If request for creating all PMA tables.
-if (isset($_REQUEST['fixall_pmadb'])) {
+if (isset($_POST['fixall_pmadb'])) {
     $relation->fixPmaTables($GLOBALS['db']);
 }
 
 $cfgRelation = $relation->getRelationsParam();
 // If request for creating missing PMA tables.
-if (isset($_REQUEST['fix_pmadb'])) {
+if (isset($_POST['fix_pmadb'])) {
     $relation->fixPmaTables($cfgRelation['db']);
 }
 
diff --git a/db_central_columns.php b/db_central_columns.php
index 84c71e3d54..5f2dc7cdaf 100644
--- a/db_central_columns.php
+++ b/db_central_columns.php
@@ -101,9 +101,9 @@ $pmadb = $cfgCentralColumns['db'];
 $pmatable = $cfgCentralColumns['table'];
 $max_rows = intval($GLOBALS['cfg']['MaxRows']);
 
-if (isset($_REQUEST['edit_central_columns_page'])) {
-    $selected_fld = $_REQUEST['selected_fld'];
-    $selected_db = $_REQUEST['db'];
+if (isset($_POST['edit_central_columns_page'])) {
+    $selected_fld = $_POST['selected_fld'];
+    $selected_db = $_POST['db'];
     $edit_central_column_page = $centralColumns->getHtmlForEditingPage(
         $selected_fld,
         $selected_db
@@ -126,15 +126,15 @@ if (isset($_POST['delete_save'])) {
         false
     );
 }
-if (!empty($_REQUEST['total_rows'])
-    && Core::isValid($_REQUEST['total_rows'], 'integer')
+if (!empty($_POST['total_rows'])
+    && Core::isValid($_POST['total_rows'], 'integer')
 ) {
-    $total_rows = $_REQUEST['total_rows'];
+    $total_rows = $_POST['total_rows'];
 } else {
     $total_rows = $centralColumns->getCount($db);
 }
-if (Core::isValid($_REQUEST['pos'], 'integer')) {
-    $pos = intval($_REQUEST['pos']);
+if (Core::isValid($_POST['pos'], 'integer')) {
+    $pos = intval($_POST['pos']);
 } else {
     $pos = 0;
 }
diff --git a/db_designer.php b/db_designer.php
index 202de74712..bc9efa69f0 100644
--- a/db_designer.php
+++ b/db_designer.php
@@ -19,18 +19,18 @@ $databaseDesigner = new Designer($GLOBALS['dbi']);
 $designerCommon = new Common($GLOBALS['dbi']);
 
 if (isset($_REQUEST['dialog'])) {
-    if ($_REQUEST['dialog'] == 'edit') {
+    if ($_GET['dialog'] == 'edit') {
         $html = $databaseDesigner->getHtmlForEditOrDeletePages($GLOBALS['db'], 'editPage');
-    } elseif ($_REQUEST['dialog'] == 'delete') {
+    } elseif ($_GET['dialog'] == 'delete') {
         $html = $databaseDesigner->getHtmlForEditOrDeletePages($GLOBALS['db'], 'deletePage');
-    } elseif ($_REQUEST['dialog'] == 'save_as') {
+    } elseif ($_GET['dialog'] == 'save_as') {
         $html = $databaseDesigner->getHtmlForPageSaveAs($GLOBALS['db']);
-    } elseif ($_REQUEST['dialog'] == 'export') {
+    } elseif ($_GET['dialog'] == 'export') {
         $html = $databaseDesigner->getHtmlForSchemaExport(
             $GLOBALS['db'],
-            $_REQUEST['selected_page']
+            $_GET['selected_page']
         );
-    } elseif ($_REQUEST['dialog'] == 'add_table') {
+    } elseif ($_POST['dialog'] == 'add_table') {
         $script_display_field = $designerCommon->getTablesInfo();
         $required = $GLOBALS['db'] . '.' . $GLOBALS['table'];
         $tab_column = $designerCommon->getColumnsInfo();
@@ -61,51 +61,51 @@ if (isset($_REQUEST['dialog'])) {
     return;
 }
 
-if (isset($_REQUEST['operation'])) {
-    if ($_REQUEST['operation'] == 'deletePage') {
-        $success = $designerCommon->deletePage($_REQUEST['selected_page']);
+if (isset($_POST['operation'])) {
+    if ($_POST['operation'] == 'deletePage') {
+        $success = $designerCommon->deletePage($_POST['selected_page']);
         $response->setRequestStatus($success);
-    } elseif ($_REQUEST['operation'] == 'savePage') {
-        if ($_REQUEST['save_page'] == 'same') {
-            $page = $_REQUEST['selected_page'];
+    } elseif ($_POST['operation'] == 'savePage') {
+        if ($_POST['save_page'] == 'same') {
+            $page = $_POST['selected_page'];
         } else { // new
-            $page = $designerCommon->createNewPage($_REQUEST['selected_value'], $GLOBALS['db']);
+            $page = $designerCommon->createNewPage($_POST['selected_value'], $GLOBALS['db']);
             $response->addJSON('id', $page);
         }
         $success = $designerCommon->saveTablePositions($page);
         $response->setRequestStatus($success);
-    } elseif ($_REQUEST['operation'] == 'setDisplayField') {
+    } elseif ($_POST['operation'] == 'setDisplayField') {
         $designerCommon->saveDisplayField(
-            $_REQUEST['db'],
-            $_REQUEST['table'],
-            $_REQUEST['field']
+            $_POST['db'],
+            $_POST['table'],
+            $_POST['field']
         );
         $response->setRequestStatus(true);
-    } elseif ($_REQUEST['operation'] == 'addNewRelation') {
+    } elseif ($_POST['operation'] == 'addNewRelation') {
         list($success, $message) = $designerCommon->addNewRelation(
-            $_REQUEST['db'],
-            $_REQUEST['T1'],
-            $_REQUEST['F1'],
-            $_REQUEST['T2'],
-            $_REQUEST['F2'],
-            $_REQUEST['on_delete'],
-            $_REQUEST['on_update'],
-            $_REQUEST['DB1'],
-            $_REQUEST['DB2']
+            $_POST['db'],
+            $_POST['T1'],
+            $_POST['F1'],
+            $_POST['T2'],
+            $_POST['F2'],
+            $_POST['on_delete'],
+            $_POST['on_update'],
+            $_POST['DB1'],
+            $_POST['DB2']
         );
         $response->setRequestStatus($success);
         $response->addJSON('message', $message);
-    } elseif ($_REQUEST['operation'] == 'removeRelation') {
+    } elseif ($_POST['operation'] == 'removeRelation') {
         list($success, $message) = $designerCommon->removeRelation(
-            $_REQUEST['T1'],
-            $_REQUEST['F1'],
-            $_REQUEST['T2'],
-            $_REQUEST['F2']
+            $_POST['T1'],
+            $_POST['F1'],
+            $_POST['T2'],
+            $_POST['F2']
         );
         $response->setRequestStatus($success);
         $response->addJSON('message', $message);
-    } elseif ($_REQUEST['operation'] == 'save_setting_value') {
-        $success = $designerCommon->saveSetting($_REQUEST['index'], $_REQUEST['value']);
+    } elseif ($_POST['operation'] == 'save_setting_value') {
+        $success = $designerCommon->saveSetting($_POST['index'], $_POST['value']);
         $response->setRequestStatus($success);
     }
 
@@ -124,13 +124,13 @@ $classes_side_menu = $databaseDesigner->returnClassNamesFromMenuButtons();
 $display_page = -1;
 $selected_page = null;
 
-if (isset($_REQUEST['query'])) {
-    $display_page = $designerCommon->getDefaultPage($_REQUEST['db']);
+if (isset($_GET['query'])) {
+    $display_page = $designerCommon->getDefaultPage($_GET['db']);
 } else {
-    if (! empty($_REQUEST['page'])) {
-        $display_page = $_REQUEST['page'];
+    if (! empty($_GET['page'])) {
+        $display_page = $_GET['page'];
     } else {
-        $display_page = $designerCommon->getLoadingPage($_REQUEST['db']);
+        $display_page = $designerCommon->getLoadingPage($_GET['db']);
     }
 }
 if ($display_page != -1) {
@@ -180,7 +180,7 @@ $response->addHTML(
         $script_contr,
         $script_display_field,
         $display_page,
-        isset($_REQUEST['query']),
+        isset($_GET['query']),
         $selected_page,
         $classes_side_menu,
         $tab_pos,
diff --git a/db_export.php b/db_export.php
index 234a7d0ccb..756b46f540 100644
--- a/db_export.php
+++ b/db_export.php
@@ -60,8 +60,8 @@ if ($num_tables < 1) {
 } // end if
 
 $multi_values  = '<div class="export_table_list_container">';
-if (isset($_GET['structure_or_data_forced'])) {
-    $force_val = htmlspecialchars($_GET['structure_or_data_forced']);
+if (isset($_POST['structure_or_data_forced'])) {
+    $force_val = htmlspecialchars($_POST['structure_or_data_forced']);
 } else {
     $force_val = 0;
 }
@@ -88,20 +88,20 @@ if (!empty($_POST['selected_tbl']) && empty($table_select)) {
     $table_select = $_POST['selected_tbl'];
 }
 
-// Check if the selected tables are defined in $_GET
+// Check if the selected tables are defined in $_POST
 // (from clicking Back button on export.php)
 foreach (['table_select', 'table_structure', 'table_data'] as $one_key) {
-    if (isset($_GET[$one_key])) {
-        $_GET[$one_key] = urldecode($_GET[$one_key]);
-        $_GET[$one_key] = explode(",", $_GET[$one_key]);
+    if (isset($_POST[$one_key])) {
+        $_POST[$one_key] = urldecode($_POST[$one_key]);
+        $_POST[$one_key] = explode(",", $_POST[$one_key]);
     }
 }
 
 foreach ($tables as $each_table) {
-    if (isset($_GET['table_select']) && is_array($_GET['table_select'])) {
+    if (isset($_POST['table_select']) && is_array($_POST['table_select'])) {
         $is_checked = $export->getCheckedClause(
             $each_table['Name'],
-            $_GET['table_select']
+            $_POST['table_select']
         );
     } elseif (isset($table_select)) {
         $is_checked = $export->getCheckedClause(
@@ -111,18 +111,18 @@ foreach ($tables as $each_table) {
     } else {
         $is_checked = ' checked="checked"';
     }
-    if (isset($_GET['table_structure']) && is_array($_GET['table_structure'])) {
+    if (isset($_POST['table_structure']) && is_array($_POST['table_structure'])) {
         $structure_checked = $export->getCheckedClause(
             $each_table['Name'],
-            $_GET['table_structure']
+            $_POST['table_structure']
         );
     } else {
         $structure_checked = $is_checked;
     }
-    if (isset($_GET['table_data']) && is_array($_GET['table_data'])) {
+    if (isset($_POST['table_data']) && is_array($_POST['table_data'])) {
         $data_checked = $export->getCheckedClause(
             $each_table['Name'],
-            $_GET['table_data']
+            $_POST['table_data']
         );
     } else {
         $data_checked = $is_checked;
diff --git a/db_operations.php b/db_operations.php
index 86128a0d26..66086fa43e 100644
--- a/db_operations.php
+++ b/db_operations.php
@@ -50,31 +50,31 @@ $relationCleanup = new RelationCleanup($GLOBALS['dbi'], $relation);
  * Rename/move or copy database
  */
 if (strlen($GLOBALS['db']) > 0
-    && (! empty($_REQUEST['db_rename']) || ! empty($_REQUEST['db_copy']))
+    && (! empty($_POST['db_rename']) || ! empty($_POST['db_copy']))
 ) {
-    if (! empty($_REQUEST['db_rename'])) {
+    if (! empty($_POST['db_rename'])) {
         $move = true;
     } else {
         $move = false;
     }
 
-    if (! isset($_REQUEST['newname']) || strlen($_REQUEST['newname']) === 0) {
+    if (! isset($_POST['newname']) || strlen($_POST['newname']) === 0) {
         $message = Message::error(__('The database name is empty!'));
     } else {
         // lower_case_table_names=1 `DB` becomes `db`
         if ($GLOBALS['dbi']->getLowerCaseNames() === '1') {
-            $_REQUEST['newname'] = mb_strtolower(
-                $_REQUEST['newname']
+            $_POST['newname'] = mb_strtolower(
+                $_POST['newname']
             );
         }
 
-        if ($_REQUEST['newname'] === $_REQUEST['db']) {
+        if ($_POST['newname'] === $_REQUEST['db']) {
             $message = Message::error(
                 __('Cannot copy database to the same name. Change the name and try again.')
             );
         } else {
             $_error = false;
-            if ($move || ! empty($_REQUEST['create_database_before_copying'])) {
+            if ($move || ! empty($_POST['create_database_before_copying'])) {
                 $operations->createDbBeforeCopy();
             }
 
@@ -143,10 +143,10 @@ if (strlen($GLOBALS['db']) > 0
             $operations->duplicateBookmarks($_error, $GLOBALS['db']);
 
             if (! $_error && $move) {
-                if (isset($_REQUEST['adjust_privileges'])
-                    && ! empty($_REQUEST['adjust_privileges'])
+                if (isset($_POST['adjust_privileges'])
+                    && ! empty($_POST['adjust_privileges'])
                 ) {
-                    $operations->adjustPrivilegesMoveDb($GLOBALS['db'], $_REQUEST['newname']);
+                    $operations->adjustPrivilegesMoveDb($GLOBALS['db'], $_POST['newname']);
                 }
 
                 /**
@@ -164,19 +164,19 @@ if (strlen($GLOBALS['db']) > 0
                     __('Database %1$s has been renamed to %2$s.')
                 );
                 $message->addParam($GLOBALS['db']);
-                $message->addParam($_REQUEST['newname']);
+                $message->addParam($_POST['newname']);
             } elseif (! $_error) {
-                if (isset($_REQUEST['adjust_privileges'])
-                    && ! empty($_REQUEST['adjust_privileges'])
+                if (isset($_POST['adjust_privileges'])
+                    && ! empty($_POST['adjust_privileges'])
                 ) {
-                    $operations->adjustPrivilegesCopyDb($GLOBALS['db'], $_REQUEST['newname']);
+                    $operations->adjustPrivilegesCopyDb($GLOBALS['db'], $_POST['newname']);
                 }
 
                 $message = Message::success(
                     __('Database %1$s has been copied to %2$s.')
                 );
                 $message->addParam($GLOBALS['db']);
-                $message->addParam($_REQUEST['newname']);
+                $message->addParam($_POST['newname']);
             } else {
                 $message = Message::error();
             }
@@ -184,13 +184,13 @@ if (strlen($GLOBALS['db']) > 0
 
             /* Change database to be used */
             if (! $_error && $move) {
-                $GLOBALS['db'] = $_REQUEST['newname'];
+                $GLOBALS['db'] = $_POST['newname'];
             } elseif (! $_error) {
-                if (isset($_REQUEST['switch_to_new'])
-                    && $_REQUEST['switch_to_new'] == 'true'
+                if (isset($_POST['switch_to_new'])
+                    && $_POST['switch_to_new'] == 'true'
                 ) {
                     $_SESSION['pma_switch_to_new'] = true;
-                    $GLOBALS['db'] = $_REQUEST['newname'];
+                    $GLOBALS['db'] = $_POST['newname'];
                 } else {
                     $_SESSION['pma_switch_to_new'] = false;
                 }
@@ -205,7 +205,7 @@ if (strlen($GLOBALS['db']) > 0
     if ($response->isAjax()) {
         $response->setRequestStatus($message->isSuccess());
         $response->addJSON('message', $message);
-        $response->addJSON('newname', $_REQUEST['newname']);
+        $response->addJSON('newname', $_POST['newname']);
         $response->addJSON(
             'sql_query',
             Util::getMessage(null, $sql_query)
@@ -224,8 +224,8 @@ $cfgRelation = $relation->getRelationsParam();
  * Check if comments were updated
  * (must be done before displaying the menu tabs)
  */
-if (isset($_REQUEST['comment'])) {
-    $relation->setDbComment($GLOBALS['db'], $_REQUEST['comment']);
+if (isset($_POST['comment'])) {
+    $relation->setDbComment($GLOBALS['db'], $_POST['comment']);
 }
 
 require 'libraries/db_common.inc.php';
@@ -253,7 +253,7 @@ if (isset($message)) {
     unset($message);
 }
 
-$_REQUEST['db_collation'] = $GLOBALS['dbi']->getDbCollation($GLOBALS['db']);
+$db_collation = $GLOBALS['dbi']->getDbCollation($GLOBALS['db']);
 $is_information_schema = $GLOBALS['dbi']->isSystemSchema($GLOBALS['db']);
 
 if (!$is_information_schema) {
@@ -272,7 +272,7 @@ if (!$is_information_schema) {
      * rename database
      */
     if ($GLOBALS['db'] != 'mysql') {
-        $response->addHTML($operations->getHtmlForRenameDatabase($GLOBALS['db']));
+        $response->addHTML($operations->getHtmlForRenameDatabase($GLOBALS['db'], $db_collation));
     }
 
     // Drop link if allowed
@@ -288,12 +288,12 @@ if (!$is_information_schema) {
     /**
      * Copy database
      */
-    $response->addHTML($operations->getHtmlForCopyDatabase($GLOBALS['db']));
+    $response->addHTML($operations->getHtmlForCopyDatabase($GLOBALS['db'], $db_collation));
 
     /**
      * Change database charset
      */
-    $response->addHTML($operations->getHtmlForChangeDatabaseCharset($GLOBALS['db'], $table));
+    $response->addHTML($operations->getHtmlForChangeDatabaseCharset($GLOBALS['db'], $db_collation));
 
     if (! $cfgRelation['allworks']
         && $cfg['PmaNoRelation_DisableWarning'] == false
@@ -304,7 +304,7 @@ if (!$is_information_schema) {
                 '%sFind out why%s.'
             )
         );
-        $message->addParamHtml('<a href="./chk_rel.php' . $url_query . '">');
+        $message->addParamHtml('<a href="./chk_rel.php" data-post="' . $url_query . '">');
         $message->addParamHtml('</a>');
         /* Show error if user has configured something, notice elsewhere */
         if (!empty($cfg['Servers'][$server]['pmadb'])) {
diff --git a/db_qbe.php b/db_qbe.php
index 9fa1b4c5ed..199f566f44 100644
--- a/db_qbe.php
+++ b/db_qbe.php
@@ -40,36 +40,36 @@ if ($cfgRelation['savedsearcheswork']) {
     //Get saved search list.
     $savedSearch = new SavedSearches($GLOBALS);
     $savedSearch->setUsername($GLOBALS['cfg']['Server']['user'])
-        ->setDbname($_REQUEST['db']);
+        ->setDbname($GLOBALS['db']);
 
-    if (!empty($_REQUEST['searchId'])) {
-        $savedSearch->setId($_REQUEST['searchId']);
+    if (!empty($_POST['searchId'])) {
+        $savedSearch->setId($_POST['searchId']);
     }
 
     //Action field is sent.
-    if (isset($_REQUEST['action'])) {
-        $savedSearch->setSearchName($_REQUEST['searchName']);
-        if ('create' === $_REQUEST['action']) {
+    if (isset($_POST['action'])) {
+        $savedSearch->setSearchName($_POST['searchName']);
+        if ('create' === $_POST['action']) {
             $saveResult = $savedSearch->setId(null)
-                ->setCriterias($_REQUEST)
+                ->setCriterias($_POST)
                 ->save();
-        } elseif ('update' === $_REQUEST['action']) {
-            $saveResult = $savedSearch->setCriterias($_REQUEST)
+        } elseif ('update' === $_POST['action']) {
+            $saveResult = $savedSearch->setCriterias($_POST)
                 ->save();
-        } elseif ('delete' === $_REQUEST['action']) {
+        } elseif ('delete' === $_POST['action']) {
             $deleteResult = $savedSearch->delete();
             //After deletion, reset search.
             $savedSearch = new SavedSearches($GLOBALS);
             $savedSearch->setUsername($GLOBALS['cfg']['Server']['user'])
-                ->setDbname($_REQUEST['db']);
-            $_REQUEST = [];
-        } elseif ('load' === $_REQUEST['action']) {
-            if (empty($_REQUEST['searchId'])) {
+                ->setDbname($GLOBALS['db']);
+            $_POST = [];
+        } elseif ('load' === $_POST['action']) {
+            if (empty($_POST['searchId'])) {
                 //when not loading a search, reset the object.
                 $savedSearch = new SavedSearches($GLOBALS);
                 $savedSearch->setUsername($GLOBALS['cfg']['Server']['user'])
-                    ->setDbname($_REQUEST['db']);
-                $_REQUEST = [];
+                    ->setDbname($GLOBALS['db']);
+                $_POST = [];
             } else {
                 $loadResult = $savedSearch->load();
             }
@@ -85,7 +85,7 @@ if ($cfgRelation['savedsearcheswork']) {
  * A query has been submitted -> (maybe) execute it
  */
 $message_to_display = false;
-if (isset($_REQUEST['submit_sql']) && ! empty($sql_query)) {
+if (isset($_POST['submit_sql']) && ! empty($sql_query)) {
     if (! preg_match('@^SELECT@i', $sql_query)) {
         $message_to_display = true;
     } else {
@@ -94,7 +94,7 @@ if (isset($_REQUEST['submit_sql']) && ! empty($sql_query)) {
         $sql->executeQueryAndSendQueryResponse(
             null, // analyzed_sql_results
             false, // is_gotofile
-            $_REQUEST['db'], // db
+            $_POST['db'], // db
             null, // table
             false, // find_real_end
             null, // sql_query_for_bookmark
diff --git a/db_search.php b/db_search.php
index 56777e7a6b..49c2aada9a 100644
--- a/db_search.php
+++ b/db_search.php
@@ -58,7 +58,7 @@ if (! $response->isAjax()) {
 }
 
 // Main search form has been submitted, get results
-if (isset($_REQUEST['submit_search'])) {
+if (isset($_POST['submit_search'])) {
     $response->addHTML($db_search->getSearchResults());
 }
 
diff --git a/db_sql.php b/db_sql.php
index fb403d484d..f842300ae2 100644
--- a/db_sql.php
+++ b/db_sql.php
@@ -44,8 +44,8 @@ $response->addHTML(
     $sqlQueryForm->getHtml(
         true,
         false,
-        isset($_REQUEST['delimiter'])
-        ? htmlspecialchars($_REQUEST['delimiter'])
+        isset($_POST['delimiter'])
+        ? htmlspecialchars($_POST['delimiter'])
         : ';'
     )
 );
diff --git a/db_tracking.php b/db_tracking.php
index 0216da7085..2f53165d34 100644
--- a/db_tracking.php
+++ b/db_tracking.php
@@ -34,6 +34,8 @@ $tracking = new Tracking();
  */
 require 'libraries/db_common.inc.php';
 $url_query .= '&amp;goto=tbl_tracking.php&amp;back=db_tracking.php';
+$url_params['goto'] = 'tbl_tracking.php';
+$url_params['back'] = 'db_tracking.php';
 
 // Get the database structure
 $sub_part = '_structure';
@@ -50,39 +52,37 @@ list(
     $pos
 ) = Util::getDbInfo($db, is_null($sub_part) ? '' : $sub_part);
 
-// Work to do?
-//  (here, do not use $_REQUEST['db] as it can be crafted)
-if (isset($_REQUEST['delete_tracking']) && isset($_REQUEST['table'])) {
-    Tracker::deleteTracking($GLOBALS['db'], $_REQUEST['table']);
+if (isset($_POST['delete_tracking']) && isset($_POST['table'])) {
+    Tracker::deleteTracking($GLOBALS['db'], $_POST['table']);
     Message::success(
         __('Tracking data deleted successfully.')
     )->display();
-} elseif (isset($_REQUEST['submit_create_version'])) {
-    $tracking->createTrackingForMultipleTables($_REQUEST['selected']);
+} elseif (isset($_POST['submit_create_version'])) {
+    $tracking->createTrackingForMultipleTables($_POST['selected']);
     Message::success(
         sprintf(
             __(
                 'Version %1$s was created for selected tables,'
                 . ' tracking is active for them.'
             ),
-            htmlspecialchars($_REQUEST['version'])
+            htmlspecialchars($_POST['version'])
         )
     )->display();
-} elseif (isset($_REQUEST['submit_mult'])) {
-    if (! empty($_REQUEST['selected_tbl'])) {
-        if ($_REQUEST['submit_mult'] == 'delete_tracking') {
-            foreach ($_REQUEST['selected_tbl'] as $table) {
+} elseif (isset($_POST['submit_mult'])) {
+    if (! empty($_POST['selected_tbl'])) {
+        if ($_POST['submit_mult'] == 'delete_tracking') {
+            foreach ($_POST['selected_tbl'] as $table) {
                 Tracker::deleteTracking($GLOBALS['db'], $table);
             }
             Message::success(
                 __('Tracking data deleted successfully.')
             )->display();
-        } elseif ($_REQUEST['submit_mult'] == 'track') {
+        } elseif ($_POST['submit_mult'] == 'track') {
             echo $tracking->getHtmlForDataDefinitionAndManipulationStatements(
                 'db_tracking.php' . $url_query,
                 0,
                 $GLOBALS['db'],
-                $_REQUEST['selected_tbl']
+                $_POST['selected_tbl']
             );
             exit;
         }
@@ -94,7 +94,7 @@ if (isset($_REQUEST['delete_tracking']) && isset($_REQUEST['table'])) {
 }
 
 // Get tracked data about the database
-$data = Tracker::getTrackedData($_REQUEST['db'], '', '1');
+$data = Tracker::getTrackedData($GLOBALS['db'], '', '1');
 
 // No tables present and no log exist
 if ($num_tables == 0 && count($data['ddlog']) == 0) {
@@ -109,7 +109,6 @@ if ($num_tables == 0 && count($data['ddlog']) == 0) {
 // ---------------------------------------------------------------------------
 echo $tracking->getHtmlForDbTrackingTables(
     $GLOBALS['db'],
-    $_REQUEST['db'],
     $url_query,
     $pmaThemeImage,
     $text_dir
diff --git a/error_report.php b/error_report.php
index 93fa64ffbd..5bb9e8ae1d 100644
--- a/error_report.php
+++ b/error_report.php
@@ -15,8 +15,8 @@ use PhpMyAdmin\Utils\HttpRequest;
 
 require_once 'libraries/common.inc.php';
 
-if (!isset($_REQUEST['exception_type'])
-    || !in_array($_REQUEST['exception_type'], ['js', 'php'])
+if (!isset($_POST['exception_type'])
+    || !in_array($_POST['exception_type'], ['js', 'php'])
 ) {
     die('Oops, something went wrong!!');
 }
@@ -25,11 +25,11 @@ $response = Response::getInstance();
 
 $errorReport = new ErrorReport(new HttpRequest());
 
-if (isset($_REQUEST['send_error_report'])
-    && ($_REQUEST['send_error_report'] == true
-    || $_REQUEST['send_error_report'] == '1')
+if (isset($_POST['send_error_report'])
+    && ($_POST['send_error_report'] == true
+    || $_POST['send_error_report'] == '1')
 ) {
-    if ($_REQUEST['exception_type'] == 'php') {
+    if ($_POST['exception_type'] == 'php') {
         /**
          * Prevent infinite error submission.
          * Happens in case error submissions fails.
@@ -53,7 +53,7 @@ if (isset($_REQUEST['send_error_report'])
             );
         }
     }
-    $reportData = $errorReport->getData($_REQUEST['exception_type']);
+    $reportData = $errorReport->getData($_POST['exception_type']);
     // report if and only if there were 'actual' errors.
     if (count($reportData) > 0) {
         $server_response = $errorReport->send($reportData);
@@ -67,8 +67,8 @@ if (isset($_REQUEST['send_error_report'])
 
         /* Message to show to the user */
         if ($success) {
-            if ((isset($_REQUEST['automatic'])
-                && $_REQUEST['automatic'] === "true")
+            if ((isset($_POST['automatic'])
+                && $_POST['automatic'] === "true")
                 || $GLOBALS['cfg']['SendErrorReports'] == 'always'
             ) {
                 $msg = __(
@@ -100,35 +100,35 @@ if (isset($_REQUEST['send_error_report'])
 
         /* Add message to response */
         if ($response->isAjax()) {
-            if ($_REQUEST['exception_type'] == 'js') {
+            if ($_POST['exception_type'] == 'js') {
                 $response->addJSON('message', $msg);
             } else {
                 $response->addJSON('_errSubmitMsg', $msg);
             }
-        } elseif ($_REQUEST['exception_type'] == 'php') {
+        } elseif ($_POST['exception_type'] == 'php') {
             $jsCode = 'PMA_ajaxShowMessage("<div class=\"error\">'
                     . $msg
                     . '</div>", false);';
             $response->getFooter()->getScripts()->addCode($jsCode);
         }
 
-        if ($_REQUEST['exception_type'] == 'php') {
+        if ($_POST['exception_type'] == 'php') {
             // clear previous errors & save new ones.
             $GLOBALS['error_handler']->savePreviousErrors();
         }
 
         /* Persist always send settings */
-        if (isset($_REQUEST['always_send'])
-            && $_REQUEST['always_send'] === "true"
+        if (isset($_POST['always_send'])
+            && $_POST['always_send'] === "true"
         ) {
             $userPreferences = new UserPreferences();
             $userPreferences->persistOption("SendErrorReports", "always", "ask");
         }
     }
-} elseif (! empty($_REQUEST['get_settings'])) {
+} elseif (! empty($_POST['get_settings'])) {
     $response->addJSON('report_setting', $GLOBALS['cfg']['SendErrorReports']);
 } else {
-    if ($_REQUEST['exception_type'] == 'js') {
+    if ($_POST['exception_type'] == 'js') {
         $response->addHTML($errorReport->getForm());
     } else {
         // clear previous errors & save new ones.
diff --git a/export.php b/export.php
index cd8b882616..c957662e1b 100644
--- a/export.php
+++ b/export.php
@@ -232,39 +232,39 @@ $filename = '';
 $separate_files = '';
 
 // Is it a quick or custom export?
-if (isset($_REQUEST['quick_or_custom'])
-    && $_REQUEST['quick_or_custom'] == 'quick'
+if (isset($_POST['quick_or_custom'])
+    && $_POST['quick_or_custom'] == 'quick'
 ) {
     $quick_export = true;
 } else {
     $quick_export = false;
 }
 
-if ($_REQUEST['output_format'] == 'astext') {
+if ($_POST['output_format'] == 'astext') {
     $asfile = false;
 } else {
     $asfile = true;
-    if (isset($_REQUEST['as_separate_files'])
-        && ! empty($_REQUEST['as_separate_files'])
+    if (isset($_POST['as_separate_files'])
+        && ! empty($_POST['as_separate_files'])
     ) {
-        if (isset($_REQUEST['compression'])
-            && ! empty($_REQUEST['compression'])
-            && $_REQUEST['compression'] == 'zip'
+        if (isset($_POST['compression'])
+            && ! empty($_POST['compression'])
+            && $_POST['compression'] == 'zip'
         ) {
-            $separate_files = $_REQUEST['as_separate_files'];
+            $separate_files = $_POST['as_separate_files'];
         }
     }
-    if (in_array($_REQUEST['compression'], $compression_methods)) {
-        $compression = $_REQUEST['compression'];
+    if (in_array($_POST['compression'], $compression_methods)) {
+        $compression = $_POST['compression'];
         $buffer_needed = true;
     }
-    if (($quick_export && ! empty($_REQUEST['quick_export_onserver']))
-        || (! $quick_export && ! empty($_REQUEST['onserver']))
+    if (($quick_export && ! empty($_POST['quick_export_onserver']))
+        || (! $quick_export && ! empty($_POST['onserver']))
     ) {
         if ($quick_export) {
-            $onserver = $_REQUEST['quick_export_onserver'];
+            $onserver = $_POST['quick_export_onserver'];
         } else {
-            $onserver = $_REQUEST['onserver'];
+            $onserver = $_POST['onserver'];
         }
         // Will we save dump on server?
         $save_on_server = ! empty($cfg['SaveDir']) && $onserver;
@@ -302,9 +302,9 @@ if ((!empty($parser->statements[0]))
 ) {
     $aliases = \PhpMyAdmin\SqlParser\Utils\Misc::getAliases($parser->statements[0], $db);
 }
-if (!empty($_REQUEST['aliases'])) {
-    $aliases = $export->mergeAliases($aliases, $_REQUEST['aliases']);
-    $_SESSION['tmpval']['aliases'] = $_REQUEST['aliases'];
+if (!empty($_POST['aliases'])) {
+    $aliases = $export->mergeAliases($aliases, $_POST['aliases']);
+    $_SESSION['tmpval']['aliases'] = $_POST['aliases'];
 }
 
 /**
@@ -466,7 +466,7 @@ do {
         if (!isset($table_data) || !is_array($table_data)) {
             $table_data = [];
         }
-        if (!empty($_REQUEST['structure_or_data_forced'])) {
+        if (!empty($_POST['structure_or_data_forced'])) {
             $table_structure = $tables;
             $table_data = $tables;
         }
diff --git a/gis_data_editor.php b/gis_data_editor.php
index 56f7aa3c9d..1a80100cff 100644
--- a/gis_data_editor.php
+++ b/gis_data_editor.php
@@ -18,14 +18,14 @@ require_once 'libraries/common.inc.php';
 
 $template = new Template();
 
-if (! isset($_REQUEST['field'])) {
+if (! isset($_POST['field'])) {
     Util::checkParameters(['field']);
 }
 
 // Get data if any posted
 $gis_data = [];
-if (Core::isValid($_REQUEST['gis_data'], 'array')) {
-    $gis_data = $_REQUEST['gis_data'];
+if (Core::isValid($_POST['gis_data'], 'array')) {
+    $gis_data = $_POST['gis_data'];
 }
 
 $gis_types = [
@@ -41,15 +41,15 @@ $gis_types = [
 // Extract type from the initial call and make sure that it's a valid one.
 // Extract from field's values if available, if not use the column type passed.
 if (! isset($gis_data['gis_type'])) {
-    if (isset($_REQUEST['type']) && $_REQUEST['type'] != '') {
-        $gis_data['gis_type'] = mb_strtoupper($_REQUEST['type']);
+    if (isset($_POST['type']) && $_POST['type'] != '') {
+        $gis_data['gis_type'] = mb_strtoupper($_POST['type']);
     }
-    if (isset($_REQUEST['value']) && trim($_REQUEST['value']) != '') {
-        $start = (substr($_REQUEST['value'], 0, 1) == "'") ? 1 : 0;
+    if (isset($_POST['value']) && trim($_POST['value']) != '') {
+        $start = (substr($_POST['value'], 0, 1) == "'") ? 1 : 0;
         $gis_data['gis_type'] = mb_substr(
-            $_REQUEST['value'],
+            $_POST['value'],
             $start,
-            mb_strpos($_REQUEST['value'], "(") - $start
+            mb_strpos($_POST['value'], "(") - $start
         );
     }
     if ((! isset($gis_data['gis_type']))
@@ -62,10 +62,10 @@ $geom_type = $gis_data['gis_type'];
 
 // Generate parameters from value passed.
 $gis_obj = GisFactory::factory($geom_type);
-if (isset($_REQUEST['value'])) {
+if (isset($_POST['value'])) {
     $gis_data = array_merge(
         $gis_data,
-        $gis_obj->generateParams($_REQUEST['value'])
+        $gis_obj->generateParams($_POST['value'])
     );
 }
 
@@ -89,7 +89,7 @@ $open_layers = GisVisualization::getByData($data, $visualizationSettings)
     ->asOl();
 
 // If the call is to update the WKT and visualization make an AJAX response
-if (isset($_REQUEST['generate']) && $_REQUEST['generate'] == true) {
+if (isset($_POST['generate']) && $_POST['generate'] == true) {
     $extra_data = [
         'result'        => $result,
         'visualization' => $visualization,
@@ -111,8 +111,8 @@ if ($geom_type == 'GEOMETRYCOLLECTION') {
 
 $templateOutput = $template->render('gis_data_editor_form', [
     'pma_theme_image' => $GLOBALS['pmaThemeImage'],
-    'field' => $_REQUEST['field'],
-    'input_name' => $_REQUEST['input_name'],
+    'field' => $_POST['field'],
+    'input_name' => $_POST['input_name'],
     'srid' => $srid,
     'visualization' => $visualization,
     'open_layers' => $open_layers,
diff --git a/import.php b/import.php
index c5388168cc..16b7977133 100644
--- a/import.php
+++ b/import.php
@@ -32,12 +32,12 @@ require_once 'libraries/common.inc.php';
 
 $import = new Import();
 
-if (isset($_REQUEST['show_as_php'])) {
-    $GLOBALS['show_as_php'] = $_REQUEST['show_as_php'];
+if (isset($_POST['show_as_php'])) {
+    $GLOBALS['show_as_php'] = $_POST['show_as_php'];
 }
 
 // If there is a request to 'Simulate DML'.
-if (isset($_REQUEST['simulate_dml'])) {
+if (isset($_POST['simulate_dml'])) {
     $import->handleSimulateDmlRequest();
     exit;
 }
@@ -47,7 +47,7 @@ $response = Response::getInstance();
 $sql = new Sql();
 
 // If it's a refresh console bookmarks request
-if (isset($_REQUEST['console_bookmark_refresh'])) {
+if (isset($_GET['console_bookmark_refresh'])) {
     $response->addJSON(
         'console_message_bookmark',
         PhpMyAdmin\Console::getBookmarkContent()
@@ -55,18 +55,18 @@ if (isset($_REQUEST['console_bookmark_refresh'])) {
     exit;
 }
 // If it's a console bookmark add request
-if (isset($_REQUEST['console_bookmark_add'])) {
-    if (isset($_REQUEST['label']) && isset($_REQUEST['db'])
-        && isset($_REQUEST['bookmark_query']) && isset($_REQUEST['shared'])
+if (isset($_POST['console_bookmark_add'])) {
+    if (isset($_POST['label']) && isset($_POST['db'])
+        && isset($_POST['bookmark_query']) && isset($_POST['shared'])
     ) {
         $cfgBookmark = Bookmark::getParams($GLOBALS['cfg']['Server']['user']);
         $bookmarkFields = [
-            'bkm_database' => $_REQUEST['db'],
+            'bkm_database' => $_POST['db'],
             'bkm_user'  => $cfgBookmark['user'],
-            'bkm_sql_query' => $_REQUEST['bookmark_query'],
-            'bkm_label' => $_REQUEST['label']
+            'bkm_sql_query' => $_POST['bookmark_query'],
+            'bkm_label' => $_POST['label']
         ];
-        $isShared = ($_REQUEST['shared'] == 'true' ? true : false);
+        $isShared = ($_POST['shared'] == 'true' ? true : false);
         $bookmark = Bookmark::createBookmark(
             $GLOBALS['dbi'],
             $GLOBALS['cfg']['Server']['user'],
@@ -128,11 +128,11 @@ $import_text = '';
 // (eg. non import, but query box/window run)
 if (! empty($sql_query)) {
     // apply values for parameters
-    if (! empty($_REQUEST['parameterized'])
-        && ! empty($_REQUEST['parameters'])
-        && is_array($_REQUEST['parameters'])
+    if (! empty($_POST['parameterized'])
+        && ! empty($_POST['parameters'])
+        && is_array($_POST['parameters'])
     ) {
-        $parameters = $_REQUEST['parameters'];
+        $parameters = $_POST['parameters'];
         foreach ($parameters as $parameter => $replacement) {
             $quoted = preg_quote($parameter, '/');
             // making sure that :param does not apply values to :param1
@@ -157,7 +157,7 @@ if (! empty($sql_query)) {
     $_SESSION['sql_from_query_box'] = true;
 
     // If there is a request to ROLLBACK when finished.
-    if (isset($_REQUEST['rollback_query'])) {
+    if (isset($_POST['rollback_query'])) {
         $import->handleRollbackRequest($import_text);
     }
 
@@ -195,7 +195,7 @@ if (! empty($sql_query)) {
     $import_type = 'queryfile';
     $format = 'sql';
     unset($sql_file);
-} elseif (! empty($_REQUEST['id_bookmark'])) {
+} elseif (! empty($_POST['id_bookmark'])) {
     // run bookmark
     $import_type = 'query';
     $format = 'sql';
@@ -309,7 +309,7 @@ if (! empty($cfg['MemoryLimit'])) {
 }
 
 $timestamp = time();
-if (isset($_REQUEST['allow_interrupt'])) {
+if (isset($_POST['allow_interrupt'])) {
     $maximum_time = ini_get('max_execution_time');
 } else {
     $maximum_time = 0;
@@ -335,9 +335,9 @@ $result = false;
 $msg = 'Sorry an unexpected error happened!';
 
 // Bookmark Support: get a query back from bookmark if required
-if (! empty($_REQUEST['id_bookmark'])) {
-    $id_bookmark = (int)$_REQUEST['id_bookmark'];
-    switch ($_REQUEST['action_bookmark']) {
+if (! empty($_POST['id_bookmark'])) {
+    $id_bookmark = (int)$_POST['id_bookmark'];
+    switch ($_POST['action_bookmark']) {
         case 0: // bookmarked query that have to be run
             $bookmark = Bookmark::get(
                 $GLOBALS['dbi'],
@@ -345,12 +345,12 @@ if (! empty($_REQUEST['id_bookmark'])) {
                 $db,
                 $id_bookmark,
                 'id',
-                isset($_REQUEST['action_bookmark_all'])
+                isset($_POST['action_bookmark_all'])
             );
 
-            if (! empty($_REQUEST['bookmark_variable'])) {
+            if (! empty($_POST['bookmark_variable'])) {
                 $import_text = $bookmark->applyVariables(
-                    $_REQUEST['bookmark_variable']
+                    $_POST['bookmark_variable']
                 );
             } else {
                 $import_text = $bookmark->getQuery();
@@ -387,7 +387,7 @@ if (! empty($_REQUEST['id_bookmark'])) {
                 $response->setRequestStatus($message->isSuccess());
                 $response->addJSON('message', $message);
                 $response->addJSON('sql_query', $import_text);
-                $response->addJSON('action_bookmark', $_REQUEST['action_bookmark']);
+                $response->addJSON('action_bookmark', $_POST['action_bookmark']);
                 exit;
             } else {
                 $run_query = false;
@@ -408,7 +408,7 @@ if (! empty($_REQUEST['id_bookmark'])) {
                     );
                     $response->setRequestStatus($message->isSuccess());
                     $response->addJSON('message', $message);
-                    $response->addJSON('action_bookmark', $_REQUEST['action_bookmark']);
+                    $response->addJSON('action_bookmark', $_POST['action_bookmark']);
                     $response->addJSON('id_bookmark', $id_bookmark);
                     exit;
                 } else {
@@ -580,11 +580,11 @@ if ($reset_charset) {
 }
 
 // Show correct message
-if (! empty($id_bookmark) && $_REQUEST['action_bookmark'] == 2) {
+if (! empty($id_bookmark) && $_POST['action_bookmark'] == 2) {
     $message = PhpMyAdmin\Message::success(__('The bookmark has been deleted.'));
     $display_query = $import_text;
     $error = false; // unset error marker, it was used just to skip processing
-} elseif (! empty($id_bookmark) && $_REQUEST['action_bookmark'] == 1) {
+} elseif (! empty($id_bookmark) && $_POST['action_bookmark'] == 1) {
     $message = PhpMyAdmin\Message::notice(__('Showing bookmark'));
 } elseif ($bookmark_created) {
     $special_message = '[br]' . sprintf(
@@ -790,6 +790,6 @@ if ($go_sql) {
 }
 
 // If there is request for ROLLBACK in the end.
-if (isset($_REQUEST['rollback_query'])) {
+if (isset($_POST['rollback_query'])) {
     $GLOBALS['dbi']->query('ROLLBACK');
 }
diff --git a/index.php b/index.php
index 6ab209e1a8..4eff01060f 100644
--- a/index.php
+++ b/index.php
@@ -624,7 +624,7 @@ if ($server > 0) {
                 );
         }
         $msg = Message::notice($msg_text);
-        $msg->addParamHtml('<a href="./chk_rel.php' . $common_url_query . '">');
+        $msg->addParamHtml('<a href="./chk_rel.php" data-post="' . $common_url_query . '">');
         $msg->addParamHtml('</a>');
         /* Show error if user has configured something, notice elsewhere */
         if (!empty($cfg['Servers'][$server]['pmadb'])) {
diff --git a/js/db_central_columns.js b/js/db_central_columns.js
index 1faa8a99db..3f649e34b2 100644
--- a/js/db_central_columns.js
+++ b/js/db_central_columns.js
@@ -65,10 +65,10 @@ AJAX.registerOnload('db_central_columns.js', function () {
             return false;
         }
         var argsep = PMA_commonParams.get('arg_separator');
-        var editColumnData = editColumnList + '' + argsep + 'edit_central_columns_page=true' + argsep + 'ajax_request=true' + argsep + 'ajax_page_request=true' + argsep + 'db=' + PMA_commonParams.get('db');
+        var editColumnData = editColumnList + '' + argsep + 'edit_central_columns_page=true' + argsep + 'ajax_request=true' + argsep + 'ajax_page_request=true' + argsep + 'db=' + encodeURIComponent(PMA_commonParams.get('db'));
         PMA_ajaxShowMessage();
         AJAX.source = $(this);
-        $.get('db_central_columns.php', editColumnData, AJAX.responseHandler);
+        $.post('db_central_columns.php', editColumnData, AJAX.responseHandler);
     });
     $('#multi_edit_central_columns').submit(function (event) {
         event.preventDefault();
diff --git a/js/db_tracking.js b/js/db_tracking.js
index 36b8ae3e2e..ce2febab9c 100644
--- a/js/db_tracking.js
+++ b/js/db_tracking.js
@@ -84,10 +84,9 @@ AJAX.registerOnload('db_tracking.js', function () {
         $anchor.PMA_confirm(question, $anchor.attr('href'), function (url) {
             PMA_ajaxShowMessage(PMA_messages.strDeletingTrackingData);
             AJAX.source = $anchor;
-            var params = {
-                'ajax_page_request': true,
-                'ajax_request': true
-            };
+            var argSep = PMA_commonParams.get('arg_separator');
+            var params = getJSConfirmCommonParam(this, $anchor.getPostData());
+            params += argSep + 'ajax_page_request=1';
             $.post(url, params, AJAX.responseHandler);
         });
     });
diff --git a/js/error_report.js b/js/error_report.js
index b35e768018..fb0eca209c 100644
--- a/js/error_report.js
+++ b/js/error_report.js
@@ -23,7 +23,7 @@ var ErrorReport = {
             exception.name = ErrorReport._extractExceptionName(exception);
         }
         ErrorReport._last_exception = exception;
-        $.get('error_report.php', {
+        $.post('error_report.php', {
             ajax_request: true,
             server: PMA_commonParams.get('server'),
             get_settings: true,
@@ -111,7 +111,7 @@ var ErrorReport = {
                         }
                     });
             }
-        }); // end $.get()
+        });
     },
     /**
      * Shows the small notification that asks for user permission
diff --git a/js/functions.js b/js/functions.js
index ef74591a9b..4b5c9c6dcf 100644
--- a/js/functions.js
+++ b/js/functions.js
@@ -3857,7 +3857,7 @@ function indexEditorDialog (url, title, callback_success, callback_failure) {
         $(this).dialog('close');
     };
     var $msgbox = PMA_ajaxShowMessage();
-    $.get('tbl_indexes.php', url, function (data) {
+    $.post('tbl_indexes.php', url, function (data) {
         if (typeof data !== 'undefined' && data.success === false) {
             // in the case of an error, show the error message returned.
             PMA_ajaxShowMessage(data.error, false);
@@ -4607,8 +4607,9 @@ function PMA_createViewDialog ($this) {
     var $msg = PMA_ajaxShowMessage();
     var syntaxHighlighter = null;
     var sep = PMA_commonParams.get('arg_separator');
-    params = $this.getPostData();
-    $.get($this.attr('href') + sep + 'ajax_request=1' + sep + 'ajax_dialog=1' + sep + params, function (data) {
+    var params = getJSConfirmCommonParam(this, $this.getPostData());
+    params += sep + 'ajax_dialog=1';
+    $.post($this.attr('href'), params, function (data) {
         if (typeof data !== 'undefined' && data.success === true) {
             PMA_ajaxRemoveMessage($msg);
             var buttonOptions = {};
diff --git a/js/indexes.js b/js/indexes.js
index a33cf50b99..255091d651 100644
--- a/js/indexes.js
+++ b/js/indexes.js
@@ -697,10 +697,7 @@ AJAX.registerOnload('indexes.js', function () {
             title = PMA_messages.strAddIndex;
         } else {
             // Edit index
-            url = $(this).find('a').attr('href');
-            if (url.substring(0, 16) === 'tbl_indexes.php?') {
-                url = url.substring(16, url.length);
-            }
+            url = $(this).find('a').getPostData();
             title = PMA_messages.strEditIndex;
         }
         url += PMA_commonParams.get('arg_separator') + 'ajax_request=true';
diff --git a/js/navigation.js b/js/navigation.js
index 2fce26031e..f116bb6593 100644
--- a/js/navigation.js
+++ b/js/navigation.js
@@ -519,12 +519,13 @@ $(function () {
     /** Hide navigation tree item */
     $(document).on('click', 'a.hideNavItem.ajax', function (event) {
         event.preventDefault();
+        var argSep = PMA_commonParams.get('arg_separator');
+        var params = $(this).getPostData();
+        params += argSep + 'ajax_request=true' + argSep + 'server=' + PMA_commonParams.get('server');
         $.ajax({
             type: 'POST',
-            data: {
-                server: PMA_commonParams.get('server'),
-            },
-            url: $(this).attr('href') + PMA_commonParams.get('arg_separator') + 'ajax_request=true',
+            data: params,
+            url: $(this).attr('href'),
             success: function (data) {
                 if (typeof data !== 'undefined' && data.success === true) {
                     PMA_reloadNavigation();
@@ -539,7 +540,10 @@ $(function () {
     $(document).on('click', 'a.showUnhide.ajax', function (event) {
         event.preventDefault();
         var $msg = PMA_ajaxShowMessage();
-        $.get($(this).attr('href') + PMA_commonParams.get('arg_separator') + 'ajax_request=1', function (data) {
+        var argSep = PMA_commonParams.get('arg_separator');
+        var params = $(this).getPostData();
+        params += argSep + 'ajax_request=true';
+        $.post($(this).attr('href'), params, function (data) {
             if (typeof data !== 'undefined' && data.success === true) {
                 PMA_ajaxRemoveMessage($msg);
                 var buttonOptions = {};
@@ -572,12 +576,13 @@ $(function () {
         var $hidden_table_count = $tr.parents('tbody').children().length;
         var $hide_dialog_box = $tr.closest('div.ui-dialog');
         var $msg = PMA_ajaxShowMessage();
+        var argSep = PMA_commonParams.get('arg_separator');
+        var params = $(this).getPostData();
+        params += argSep + 'ajax_request=true' + argSep + 'server=' + PMA_commonParams.get('server');
         $.ajax({
             type: 'POST',
-            data: {
-                server: PMA_commonParams.get('server'),
-            },
-            url: $(this).attr('href') + PMA_commonParams.get('arg_separator') + 'ajax_request=true',
+            data: params,
+            url: $(this).attr('href'),
             success: function (data) {
                 PMA_ajaxRemoveMessage($msg);
                 if (typeof data !== 'undefined' && data.success === true) {
diff --git a/js/server_databases.js b/js/server_databases.js
index 2285619b74..a1a00513f0 100644
--- a/js/server_databases.js
+++ b/js/server_databases.js
@@ -60,13 +60,14 @@ AJAX.registerOnload('server_databases.js', function () {
         $(this).PMA_confirm(
             question,
             $form.prop('action') + '?' + $(this).serialize() +
-                argsep + 'drop_selected_dbs=1' + argsep + 'is_js_confirmed=1' + argsep + 'ajax_request=true',
+                argsep + 'drop_selected_dbs=1',
             function (url) {
                 PMA_ajaxShowMessage(PMA_messages.strProcessingRequest, false);
 
-                var params = getJSConfirmCommonParam(this);
+                var parts = url.split('?');
+                var params = getJSConfirmCommonParam(this, parts[1]);
 
-                $.post(url, params, function (data) {
+                $.post(parts[0], params, function (data) {
                     if (typeof data !== 'undefined' && data.success === true) {
                         PMA_ajaxShowMessage(data.message);
 
diff --git a/js/server_status_monitor.js b/js/server_status_monitor.js
index e6b67e920c..149378ab15 100644
--- a/js/server_status_monitor.js
+++ b/js/server_status_monitor.js
@@ -686,7 +686,7 @@ AJAX.registerOnload('server_status_monitor.js', function () {
                 $.extend(vars, getvars);
             }
 
-            $.get('server_status_monitor.php' + PMA_commonParams.get('common_query'), vars,
+            $.post('server_status_monitor.php' + PMA_commonParams.get('common_query'), vars,
                 function (data) {
                     var logVars;
                     if (typeof data !== 'undefined' && data.success === true) {
@@ -1591,9 +1591,10 @@ AJAX.registerOnload('server_status_monitor.js', function () {
             buttons: dlgBtns
         });
 
-
-        logRequest = $.get('server_status_monitor.php' + PMA_commonParams.get('common_query'),
-            {   ajax_request: true,
+        logRequest = $.post(
+            'server_status_monitor.php' + PMA_commonParams.get('common_query'),
+            {
+                ajax_request: true,
                 log_data: 1,
                 type: opts.src,
                 time_start: Math.round(opts.start / 1000),
diff --git a/js/server_status_processes.js b/js/server_status_processes.js
index 928c10b328..2865bca9a7 100644
--- a/js/server_status_processes.js
+++ b/js/server_status_processes.js
@@ -47,10 +47,12 @@ var processList = {
      */
     killProcessHandler: function (event) {
         event.preventDefault();
-        var url = $(this).attr('href');
+        var argSep = PMA_commonParams.get('arg_separator');
+        var params = $(this).getPostData();
+        params += argSep + 'ajax_request=1' + argSep + 'server=' + PMA_commonParams.get('server');
         // Get row element of the process to be killed.
         var $tr = $(this).closest('tr');
-        $.getJSON(url, function (data) {
+        $.post($(this).attr('href'), params, function (data) {
             // Check if process was killed or not.
             if (data.hasOwnProperty('success') && data.success) {
                 // remove the row of killed process.
@@ -66,7 +68,7 @@ var processList = {
                 // Show process error message
                 PMA_ajaxShowMessage(data.error, false);
             }
-        });
+        }, 'json');
     },
 
     /**
@@ -86,7 +88,7 @@ var processList = {
         if (processList.autoRefresh) {
             var interval = parseInt(processList.refreshInterval, 10) * 1000;
             var urlParams = processList.getUrlParams();
-            processList.refreshRequest = $.get(processList.refreshUrl,
+            processList.refreshRequest = $.post(processList.refreshUrl,
                 urlParams,
                 function (data) {
                     if (data.hasOwnProperty('success') && data.success) {
diff --git a/js/sql.js b/js/sql.js
index 813a4d0ba1..38f14b3552 100644
--- a/js/sql.js
+++ b/js/sql.js
@@ -866,7 +866,10 @@ function browseForeignDialog ($this_a) {
     var tableId = '#browse_foreign_table';
     var filterId = '#input_foreign_filter';
     var $dialog = null;
-    $.get($this_a.attr('href'), { 'ajax_request': true }, function (data) {
+    var argSep = PMA_commonParams.get('arg_separator');
+    var params = $this_a.getPostData();
+    params += argSep + 'ajax_request=true';
+    $.post($this_a.attr('href'), params, function (data) {
         // Creates browse foreign value dialog
         $dialog = $('<div>').append(data.message).dialog({
             title: PMA_messages.strBrowseForeignValues,
diff --git a/js/tbl_relation.js b/js/tbl_relation.js
index 6446b8b1e6..ffc0aff435 100644
--- a/js/tbl_relation.js
+++ b/js/tbl_relation.js
@@ -72,7 +72,7 @@ function getDropdownValues ($dropdown) {
     var $msgbox = PMA_ajaxShowMessage();
     var $form = $dropdown.parents('form');
     var argsep = PMA_commonParams.get('arg_separator');
-    var url = 'tbl_relation.php?getDropdownValues=true' + argsep + 'ajax_request=true' +
+    var params = 'getDropdownValues=true' + argsep + 'ajax_request=true' +
         argsep + 'db=' + $form.find('input[name="db"]').val() +
         argsep + 'table=' + $form.find('input[name="table"]').val() +
         argsep + 'foreign=' + (foreign !== '') +
@@ -82,11 +82,13 @@ function getDropdownValues ($dropdown) {
         );
     var $server = $form.find('input[name="server"]');
     if ($server.length > 0) {
-        url += argsep + 'server=' + $form.find('input[name="server"]').val();
+        params += argsep + 'server=' + $form.find('input[name="server"]').val();
     }
     $.ajax({
-        url: url,
-        datatype: 'json',
+        type: 'POST',
+        url: 'tbl_relation.php',
+        data: params,
+        dataType: 'json',
         success: function (data) {
             PMA_ajaxRemoveMessage($msgbox);
             if (typeof data !== 'undefined' && data.success) {
diff --git a/js/tbl_tracking.js b/js/tbl_tracking.js
index 9415f37a66..cd08957302 100644
--- a/js/tbl_tracking.js
+++ b/js/tbl_tracking.js
@@ -80,10 +80,9 @@ AJAX.registerOnload('tbl_tracking.js', function () {
         $anchor.PMA_confirm(question, $anchor.attr('href'), function (url) {
             PMA_ajaxShowMessage();
             AJAX.source = $anchor;
-            var params = {
-                'ajax_page_request': true,
-                'ajax_request': true
-            };
+            var argSep = PMA_commonParams.get('arg_separator');
+            var params = getJSConfirmCommonParam(this, $anchor.getPostData());
+            params += argSep + 'ajax_page_request=1';
             $.post(url, params, AJAX.responseHandler);
         });
     });
@@ -98,10 +97,9 @@ AJAX.registerOnload('tbl_tracking.js', function () {
         $anchor.PMA_confirm(question, $anchor.attr('href'), function (url) {
             PMA_ajaxShowMessage();
             AJAX.source = $anchor;
-            var params = {
-                'ajax_page_request': true,
-                'ajax_request': true
-            };
+            var argSep = PMA_commonParams.get('arg_separator');
+            var params = getJSConfirmCommonParam(this, $anchor.getPostData());
+            params += argSep + 'ajax_page_request=1';
             $.post(url, params, AJAX.responseHandler);
         });
     });
diff --git a/libraries/classes/BrowseForeigners.php b/libraries/classes/BrowseForeigners.php
index b38115e70a..8fd7e7f0c7 100644
--- a/libraries/classes/BrowseForeigners.php
+++ b/libraries/classes/BrowseForeigners.php
@@ -186,12 +186,12 @@ class BrowseForeigners
             . '<input type="hidden" name="fieldkey" value="'
             . (isset($fieldkey) ? htmlspecialchars($fieldkey) : '') . '" />';
 
-        if (isset($_REQUEST['rownumber'])) {
+        if (isset($_POST['rownumber'])) {
             $output .= '<input type="hidden" name="rownumber" value="'
-                . htmlspecialchars((string) $_REQUEST['rownumber']) . '" />';
+                . htmlspecialchars((string) $_POST['rownumber']) . '" />';
         }
-        $filter_value = (isset($_REQUEST['foreign_filter'])
-            ? htmlspecialchars($_REQUEST['foreign_filter'])
+        $filter_value = (isset($_POST['foreign_filter'])
+            ? htmlspecialchars($_POST['foreign_filter'])
             : '');
         $output .= '<span class="formelement">'
             . '<label for="input_foreign_filter">' . __('Search:') . '</label>'
@@ -308,7 +308,7 @@ class BrowseForeigners
     private function getHtmlForGotoPage(?array $foreignData): string
     {
         $gotopage = '';
-        isset($_REQUEST['pos']) ? $pos = $_REQUEST['pos'] : $pos = 0;
+        isset($_POST['pos']) ? $pos = $_POST['pos'] : $pos = 0;
         if (!is_array($foreignData['disp_row'])) {
             return $gotopage;
         }
@@ -346,7 +346,7 @@ class BrowseForeigners
         if (isset($foreignShowAll) && $foreignShowAll == __('Show all')) {
             return null;
         }
-        isset($_REQUEST['pos']) ? $pos = $_REQUEST['pos'] : $pos = 0;
+        isset($_POST['pos']) ? $pos = $_POST['pos'] : $pos = 0;
         return 'LIMIT ' . $pos . ', ' . $this->maxRows . ' ';
     }
 }
diff --git a/libraries/classes/CentralColumns.php b/libraries/classes/CentralColumns.php
index ba2f9ddac9..c383e1c252 100644
--- a/libraries/classes/CentralColumns.php
+++ b/libraries/classes/CentralColumns.php
@@ -310,7 +310,7 @@ class CentralColumns
         if (empty($cfgCentralColumns)) {
             return $this->configErrorMessage();
         }
-        $db = $_REQUEST['db'];
+        $db = $_POST['db'];
         $pmadb = $cfgCentralColumns['db'];
         $central_list_table = $cfgCentralColumns['table'];
         $this->dbi->selectDb($db);
@@ -350,7 +350,7 @@ class CentralColumns
             }
         } else {
             if ($table === null) {
-                $table = $_REQUEST['table'];
+                $table = $_POST['table'];
             }
             foreach ($field_select as $column) {
                 $cols .= "'" . $this->dbi->escapeString($column) . "',";
@@ -429,7 +429,7 @@ class CentralColumns
         if (empty($cfgCentralColumns)) {
             return $this->configErrorMessage();
         }
-        $db = $_REQUEST['db'];
+        $db = $_POST['db'];
         $pmadb = $cfgCentralColumns['db'];
         $central_list_table = $cfgCentralColumns['table'];
         $this->dbi->selectDb($db);
diff --git a/libraries/classes/Controllers/Server/ServerBinlogController.php b/libraries/classes/Controllers/Server/ServerBinlogController.php
index 57cca6daff..dc6813e749 100644
--- a/libraries/classes/Controllers/Server/ServerBinlogController.php
+++ b/libraries/classes/Controllers/Server/ServerBinlogController.php
@@ -60,15 +60,15 @@ class ServerBinlogController extends Controller
         include_once 'libraries/server_common.inc.php';
 
         $url_params = [];
-        if (! isset($_REQUEST['log'])
-            || ! array_key_exists($_REQUEST['log'], $this->binary_logs)
+        if (! isset($_POST['log'])
+            || ! array_key_exists($_POST['log'], $this->binary_logs)
         ) {
-            $_REQUEST['log'] = '';
+            $_POST['log'] = '';
         } else {
-            $url_params['log'] = $_REQUEST['log'];
+            $url_params['log'] = $_POST['log'];
         }
 
-        if (!empty($_REQUEST['dontlimitchars'])) {
+        if (!empty($_POST['dontlimitchars'])) {
             $url_params['dontlimitchars'] = 1;
         }
 
@@ -93,7 +93,7 @@ class ServerBinlogController extends Controller
         return $this->template->render('server/binlog/log_selector', [
             'url_params' => $url_params,
             'binary_logs' => $this->binary_logs,
-            'log' => $_REQUEST['log'],
+            'log' => $_POST['log'],
         ]);
     }
 
@@ -109,16 +109,16 @@ class ServerBinlogController extends Controller
         /**
          * Need to find the real end of rows?
          */
-        if (! isset($_REQUEST['pos'])) {
+        if (! isset($_POST['pos'])) {
             $pos = 0;
         } else {
             /* We need this to be a integer */
-            $pos = (int) $_REQUEST['pos'];
+            $pos = (int) $_POST['pos'];
         }
 
         $sql_query = 'SHOW BINLOG EVENTS';
-        if (! empty($_REQUEST['log'])) {
-            $sql_query .= ' IN \'' . $_REQUEST['log'] . '\'';
+        if (! empty($_POST['log'])) {
+            $sql_query .= ' IN \'' . $_POST['log'] . '\'';
         }
         $sql_query .= ' LIMIT ' . $pos . ', ' . intval($GLOBALS['cfg']['MaxRows']);
 
@@ -137,7 +137,7 @@ class ServerBinlogController extends Controller
             $num_rows = 0;
         }
 
-        if (empty($_REQUEST['dontlimitchars'])) {
+        if (empty($_POST['dontlimitchars'])) {
             $dontlimitchars = false;
         } else {
             $dontlimitchars = true;
@@ -195,8 +195,8 @@ class ServerBinlogController extends Controller
                 $this_url_params['pos'] = $pos - $GLOBALS['cfg']['MaxRows'];
             }
 
-            $html .= '<a href="server_binlog.php'
-                . Url::getCommon($this_url_params) . '"';
+            $html .= '<a href="server_binlog.php" data-post="'
+                . Url::getCommon($this_url_params, '') . '"';
             if (Util::showIcons('TableNavigationLinksMode')) {
                 $html .= ' title="' . _pgettext('Previous page', 'Previous') . '">';
             } else {
@@ -218,7 +218,7 @@ class ServerBinlogController extends Controller
             $tempTitle = __('Show Full Queries');
             $tempImgMode = 'full';
         }
-        $html .= '<a href="server_binlog.php' . Url::getCommon($this_url_params)
+        $html .= '<a href="server_binlog.php" data-post="' . Url::getCommon($this_url_params, '')
             . '" title="' . $tempTitle . '">'
             . '<img src="' . $GLOBALS['pmaThemeImage'] . 's_' . $tempImgMode
             . 'text.png" alt="' . $tempTitle . '" /></a>';
@@ -228,8 +228,8 @@ class ServerBinlogController extends Controller
         if ($num_rows >= $GLOBALS['cfg']['MaxRows']) {
             $this_url_params = $url_params;
             $this_url_params['pos'] = $pos + $GLOBALS['cfg']['MaxRows'];
-            $html .= ' - <a href="server_binlog.php'
-                . Url::getCommon($this_url_params)
+            $html .= ' - <a href="server_binlog.php" data-post="'
+                . Url::getCommon($this_url_params, '')
                 . '"';
             if (Util::showIcons('TableNavigationLinksMode')) {
                 $html .= ' title="' . _pgettext('Next page', 'Next') . '">';
diff --git a/libraries/classes/Controllers/Server/ServerDatabasesController.php b/libraries/classes/Controllers/Server/ServerDatabasesController.php
index 62aa2d9717..4321cec0d6 100644
--- a/libraries/classes/Controllers/Server/ServerDatabasesController.php
+++ b/libraries/classes/Controllers/Server/ServerDatabasesController.php
@@ -61,7 +61,7 @@ class ServerDatabasesController extends Controller
 
         $response = Response::getInstance();
 
-        if (isset($_REQUEST['drop_selected_dbs'])
+        if (isset($_POST['drop_selected_dbs'])
             && $response->isAjax()
             && ($this->dbi->isSuperuser() || $GLOBALS['cfg']['AllowUserDropDatabase'])
         ) {
@@ -214,7 +214,7 @@ class ServerDatabasesController extends Controller
      */
     public function dropDatabasesAction()
     {
-        if (! isset($_REQUEST['selected_dbs'])) {
+        if (! isset($_POST['selected_dbs'])) {
             $message = Message::error(__('No databases selected.'));
         } else {
             $action = 'server_databases.php';
diff --git a/libraries/classes/Controllers/Server/ServerVariablesController.php b/libraries/classes/Controllers/Server/ServerVariablesController.php
index b09977ff40..6d6b4cb815 100644
--- a/libraries/classes/Controllers/Server/ServerVariablesController.php
+++ b/libraries/classes/Controllers/Server/ServerVariablesController.php
@@ -48,16 +48,16 @@ class ServerVariablesController extends Controller
     {
         $response = Response::getInstance();
         if ($response->isAjax()
-            && isset($_REQUEST['type'])
-            && $_REQUEST['type'] === 'getval'
+            && isset($_GET['type'])
+            && $_GET['type'] === 'getval'
         ) {
             $this->getValueAction();
             return;
         }
 
         if ($response->isAjax()
-            && isset($_REQUEST['type'])
-            && $_REQUEST['type'] === 'setval'
+            && isset($_POST['type'])
+            && $_POST['type'] === 'setval'
         ) {
             $this->setValueAction();
             return;
@@ -138,12 +138,12 @@ class ServerVariablesController extends Controller
         // when server is running in ANSI_QUOTES sql_mode
         $varValue = $this->dbi->fetchSingleRow(
             'SHOW GLOBAL VARIABLES WHERE Variable_name=\''
-            . $this->dbi->escapeString($_REQUEST['varName']) . '\';',
+            . $this->dbi->escapeString($_GET['varName']) . '\';',
             'NUM'
         );
 
         try {
-            $type = KBSearch::getVariableType($_REQUEST['varName']);
+            $type = KBSearch::getVariableType($_GET['varName']);
             if ($type === 'byte') {
                 $this->response->addJSON(
                     'message',
@@ -170,10 +170,10 @@ class ServerVariablesController extends Controller
      */
     public function setValueAction()
     {
-        $value = $_REQUEST['varValue'];
+        $value = $_POST['varValue'];
         $matches = [];
         try {
-            $type = KBSearch::getVariableType($_REQUEST['varName']);
+            $type = KBSearch::getVariableType($_POST['varName']);
             if ($type === 'byte' && preg_match(
                 '/^\s*(\d+(\.\d+)?)\s*(mb|kb|mib|kib|gb|gib)\s*$/i',
                 $value,
@@ -202,20 +202,20 @@ class ServerVariablesController extends Controller
             $value = "'" . $value . "'";
         }
 
-        if (! preg_match("/[^a-zA-Z0-9_]+/", $_REQUEST['varName'])
+        if (! preg_match("/[^a-zA-Z0-9_]+/", $_POST['varName'])
             && $this->dbi->query(
-                'SET GLOBAL ' . $_REQUEST['varName'] . ' = ' . $value
+                'SET GLOBAL ' . $_POST['varName'] . ' = ' . $value
             )
         ) {
             // Some values are rounded down etc.
             $varValue = $this->dbi->fetchSingleRow(
                 'SHOW GLOBAL VARIABLES WHERE Variable_name="'
-                . $this->dbi->escapeString($_REQUEST['varName'])
+                . $this->dbi->escapeString($_POST['varName'])
                 . '";',
                 'NUM'
             );
             list($formattedValue, $isHtmlFormatted) = $this->_formatVariable(
-                $_REQUEST['varName'],
+                $_POST['varName'],
                 $varValue[1]
             );
 
diff --git a/libraries/classes/Controllers/Table/TableIndexesController.php b/libraries/classes/Controllers/Table/TableIndexesController.php
index 9552943f34..b76356f985 100644
--- a/libraries/classes/Controllers/Table/TableIndexesController.php
+++ b/libraries/classes/Controllers/Table/TableIndexesController.php
@@ -55,7 +55,7 @@ class TableIndexesController extends TableController
      */
     public function indexAction()
     {
-        if (isset($_REQUEST['do_save_data'])) {
+        if (isset($_POST['do_save_data'])) {
             $this->doSaveDataAction();
             return;
         } // end builds the new index
@@ -72,24 +72,24 @@ class TableIndexesController extends TableController
     {
         $this->dbi->selectDb($GLOBALS['db']);
         $add_fields = 0;
-        if (isset($_REQUEST['index']) && is_array($_REQUEST['index'])) {
+        if (isset($_POST['index']) && is_array($_POST['index'])) {
             // coming already from form
-            if (isset($_REQUEST['index']['columns']['names'])) {
-                $add_fields = count($_REQUEST['index']['columns']['names'])
+            if (isset($_POST['index']['columns']['names'])) {
+                $add_fields = count($_POST['index']['columns']['names'])
                     - $this->index->getColumnCount();
             }
-            if (isset($_REQUEST['add_fields'])) {
-                $add_fields += $_REQUEST['added_fields'];
+            if (isset($_POST['add_fields'])) {
+                $add_fields += $_POST['added_fields'];
             }
-        } elseif (isset($_REQUEST['create_index'])) {
-            $add_fields = $_REQUEST['added_fields'];
+        } elseif (isset($_POST['create_index'])) {
+            $add_fields = $_POST['added_fields'];
         } // end preparing form values
 
         // Get fields and stores their name/type
-        if (isset($_REQUEST['create_edit_table'])) {
-            $fields = json_decode($_REQUEST['columns'], true);
+        if (isset($_POST['create_edit_table'])) {
+            $fields = json_decode($_POST['columns'], true);
             $index_params = [
-                'Non_unique' => $_REQUEST['index']['Index_choice'] == 'UNIQUE'
+                'Non_unique' => $_POST['index']['Index_choice'] == 'UNIQUE'
                     ? '0' : '1',
             ];
             $this->index->set($index_params);
@@ -104,12 +104,12 @@ class TableIndexesController extends TableController
             'table' => $this->table,
         ];
 
-        if (isset($_REQUEST['create_index'])) {
+        if (isset($_POST['create_index'])) {
             $form_params['create_index'] = 1;
-        } elseif (isset($_REQUEST['old_index'])) {
-            $form_params['old_index'] = $_REQUEST['old_index'];
-        } elseif (isset($_REQUEST['index'])) {
-            $form_params['old_index'] = $_REQUEST['index'];
+        } elseif (isset($_POST['old_index'])) {
+            $form_params['old_index'] = $_POST['old_index'];
+        } elseif (isset($_POST['index'])) {
+            $form_params['old_index'] = $_POST['index'];
         }
 
         $this->response->getHeader()->getScripts()->addFile('indexes.js');
@@ -120,7 +120,7 @@ class TableIndexesController extends TableController
                 'index' => $this->index,
                 'form_params' => $form_params,
                 'add_fields' => $add_fields,
-                'create_edit_table' => isset($_REQUEST['create_edit_table']),
+                'create_edit_table' => isset($_POST['create_edit_table']),
                 'default_sliders_state' => $GLOBALS['cfg']['InitialSlidersState'],
             ])
         );
@@ -141,7 +141,7 @@ class TableIndexesController extends TableController
             ->getSqlQueryForIndexCreateOrEdit($this->index, $error);
 
         // If there is a request for SQL previewing.
-        if (isset($_REQUEST['preview_sql'])) {
+        if (isset($_POST['preview_sql'])) {
             $this->response->addJSON(
                 'sql_data',
                 $this->template->render('preview_sql', ['query_data' => $sql_query])
diff --git a/libraries/classes/Controllers/Table/TableRelationController.php b/libraries/classes/Controllers/Table/TableRelationController.php
index 2982f91f95..c95e718335 100644
--- a/libraries/classes/Controllers/Table/TableRelationController.php
+++ b/libraries/classes/Controllers/Table/TableRelationController.php
@@ -105,11 +105,11 @@ class TableRelationController extends TableController
     {
         // Send table of column names to populate corresponding dropdowns depending
         // on the current selection
-        if (isset($_REQUEST['getDropdownValues'])
-            && $_REQUEST['getDropdownValues'] === 'true'
+        if (isset($_POST['getDropdownValues'])
+            && $_POST['getDropdownValues'] === 'true'
         ) {
             // if both db and table are selected
-            if (isset($_REQUEST['foreignTable'])) {
+            if (isset($_POST['foreignTable'])) {
                 $this->getDropdownValueForTableAction();
             } else { // if only the db is selected
                 $this->getDropdownValueForDbAction();
@@ -241,8 +241,8 @@ class TableRelationController extends TableController
      */
     public function updateForForeignKeysAction()
     {
-        $multi_edit_columns_name = isset($_REQUEST['foreign_key_fields_name'])
-            ? $_REQUEST['foreign_key_fields_name']
+        $multi_edit_columns_name = isset($_POST['foreign_key_fields_name'])
+            ? $_POST['foreign_key_fields_name']
             : null;
 
         // (for now, one index name only; we keep the definitions if the
@@ -262,7 +262,7 @@ class TableRelationController extends TableController
         $this->response->addHTML($html);
 
         // If there is a request for SQL previewing.
-        if (isset($_REQUEST['preview_sql'])) {
+        if (isset($_POST['preview_sql'])) {
             Core::previewSQL($preview_sql_data);
         }
 
@@ -285,8 +285,8 @@ class TableRelationController extends TableController
      */
     public function updateForInternalRelationAction()
     {
-        $multi_edit_columns_name = isset($_REQUEST['fields_name'])
-            ? $_REQUEST['fields_name']
+        $multi_edit_columns_name = isset($_POST['fields_name'])
+            ? $_POST['fields_name']
             : null;
 
         if ($this->upd_query->updateInternalRelations(
@@ -316,8 +316,8 @@ class TableRelationController extends TableController
      */
     public function getDropdownValueForTableAction()
     {
-        $foreignTable = $_REQUEST['foreignTable'];
-        $table_obj = $this->dbi->getTable($_REQUEST['foreignDb'], $foreignTable);
+        $foreignTable = $_POST['foreignTable'];
+        $table_obj = $this->dbi->getTable($_POST['foreignDb'], $foreignTable);
         // Since views do not have keys defined on them provide the full list of
         // columns
         if ($table_obj->isView()) {
@@ -335,7 +335,7 @@ class TableRelationController extends TableController
         $this->response->addJSON('columns', $columns);
 
         // @todo should be: $server->db($db)->table($table)->primary()
-        $primary = Index::getPrimary($foreignTable, $_REQUEST['foreignDb']);
+        $primary = Index::getPrimary($foreignTable, $_POST['foreignDb']);
         if (false === $primary) {
             return;
         }
@@ -352,11 +352,11 @@ class TableRelationController extends TableController
     public function getDropdownValueForDbAction()
     {
         $tables = [];
-        $foreign = isset($_REQUEST['foreign']) && $_REQUEST['foreign'] === 'true';
+        $foreign = isset($_POST['foreign']) && $_POST['foreign'] === 'true';
 
         if ($foreign) {
             $query = 'SHOW TABLE STATUS FROM '
-                . Util::backquote($_REQUEST['foreignDb']);
+                . Util::backquote($_POST['foreignDb']);
             $tables_rs = $this->dbi->query(
                 $query,
                 DatabaseInterface::CONNECT_USER,
@@ -372,7 +372,7 @@ class TableRelationController extends TableController
             }
         } else {
             $query = 'SHOW TABLES FROM '
-                . Util::backquote($_REQUEST['foreignDb']);
+                . Util::backquote($_POST['foreignDb']);
             $tables_rs = $this->dbi->query(
                 $query,
                 DatabaseInterface::CONNECT_USER,
diff --git a/libraries/classes/Controllers/Table/TableSearchController.php b/libraries/classes/Controllers/Table/TableSearchController.php
index a0ef7bd31d..545cac0579 100644
--- a/libraries/classes/Controllers/Table/TableSearchController.php
+++ b/libraries/classes/Controllers/Table/TableSearchController.php
@@ -221,7 +221,7 @@ class TableSearchController extends TableController
                     ]
                 );
 
-                if (isset($_REQUEST['range_search'])) {
+                if (isset($_POST['range_search'])) {
                     $this->rangeSearchAction();
 
                     return;
@@ -262,8 +262,8 @@ class TableSearchController extends TableController
              *
              * @var boolean Object containing parameters for the POST request
              */
-                if (isset($_REQUEST['get_data_row'])
-                    && $_REQUEST['get_data_row'] == true
+                if (isset($_POST['get_data_row'])
+                    && $_POST['get_data_row'] == true
                 ) {
                     $this->getDataRowAction();
 
@@ -275,8 +275,8 @@ class TableSearchController extends TableController
              *
              * @var boolean Object containing parameters for the POST request
              */
-                if (isset($_REQUEST['change_tbl_info'])
-                && $_REQUEST['change_tbl_info'] == true
+                if (isset($_POST['change_tbl_info'])
+                && $_POST['change_tbl_info'] == true
                 ) {
                     $this->changeTableInfoAction();
 
@@ -407,7 +407,7 @@ class TableSearchController extends TableController
      */
     public function changeTableInfoAction()
     {
-        $field = $_REQUEST['field'];
+        $field = $_POST['field'];
         if ($field == 'pma_null') {
             $this->response->addJSON('field_type', '');
             $this->response->addJSON('field_collation', '');
@@ -417,8 +417,8 @@ class TableSearchController extends TableController
         }
         $key = array_search($field, $this->_columnNames);
         $search_index
-            = (isset($_REQUEST['it']) && is_numeric($_REQUEST['it'])
-                ? intval($_REQUEST['it']) : 0);
+            = (isset($_POST['it']) && is_numeric($_POST['it'])
+                ? intval($_POST['it']) : 0);
 
         $properties = $this->getColumnProperties($search_index, $key);
         $this->response->addJSON(
@@ -438,8 +438,8 @@ class TableSearchController extends TableController
     public function getDataRowAction()
     {
         $extra_data = [];
-        $row_info_query = 'SELECT * FROM `' . $_REQUEST['db'] . '`.`'
-            . $_REQUEST['table'] . '` WHERE ' . $_REQUEST['where_clause'];
+        $row_info_query = 'SELECT * FROM `' . $_POST['db'] . '`.`'
+            . $_POST['table'] . '` WHERE ' . $_POST['where_clause'];
         $result = $this->dbi->query(
             $row_info_query . ";",
             DatabaseInterface::CONNECT_USER,
@@ -584,7 +584,7 @@ class TableSearchController extends TableController
      */
     public function rangeSearchAction()
     {
-        $min_max = $this->getColumnMinMax($_REQUEST['column']);
+        $min_max = $this->getColumnMinMax($_POST['column']);
         $this->response->addJSON('column_data', $min_max);
     }
 
diff --git a/libraries/classes/Controllers/Table/TableStructureController.php b/libraries/classes/Controllers/Table/TableStructureController.php
index 23e2c5eeec..28781a7554 100644
--- a/libraries/classes/Controllers/Table/TableStructureController.php
+++ b/libraries/classes/Controllers/Table/TableStructureController.php
@@ -163,8 +163,8 @@ class TableStructureController extends TableController
         /**
          * Handle column moving
          */
-        if (isset($_REQUEST['move_columns'])
-            && is_array($_REQUEST['move_columns'])
+        if (isset($_POST['move_columns'])
+            && is_array($_POST['move_columns'])
             && $this->response->isAjax()
         ) {
             $this->moveColumns();
@@ -174,9 +174,9 @@ class TableStructureController extends TableController
         /**
          * handle MySQL reserved words columns check
          */
-        if (isset($_REQUEST['reserved_word_check'])) {
+        if (isset($_POST['reserved_word_check'])) {
             if ($GLOBALS['cfg']['ReservedWordDisableWarning'] === false) {
-                $columns_names = $_REQUEST['field_name'];
+                $columns_names = $_POST['field_name'];
                 $reserved_keywords_names = [];
                 foreach ($columns_names as $column) {
                     if (Context::isKeyword(trim($column), true)) {
@@ -208,7 +208,7 @@ class TableStructureController extends TableController
         /**
          * A click on Change has been made for one column
          */
-        if (isset($_REQUEST['change_column'])) {
+        if (isset($_GET['change_column'])) {
             $this->displayHtmlForColumnChange(null, 'tbl_structure.php');
             return;
         }
@@ -216,8 +216,8 @@ class TableStructureController extends TableController
         /**
          * Adding or editing partitioning of the table
          */
-        if (isset($_REQUEST['edit_partitioning'])
-            && ! isset($_REQUEST['save_partitioning'])
+        if (isset($_POST['edit_partitioning'])
+            && ! isset($_POST['save_partitioning'])
         ) {
             $this->displayHtmlForPartitionChange();
             return;
@@ -231,7 +231,7 @@ class TableStructureController extends TableController
         $submit_mult = $this->getMultipleFieldCommandType();
 
         if (! empty($submit_mult)) {
-            if (isset($_REQUEST['selected_fld'])) {
+            if (isset($_POST['selected_fld'])) {
                 if ($submit_mult == 'browse') {
                     // browsing the table displaying only selected columns
                     $this->displayTableBrowseForSelectedColumns(
@@ -242,14 +242,14 @@ class TableStructureController extends TableController
                     // handle multiple field commands
                     // handle confirmation of deleting multiple columns
                     $action = 'tbl_structure.php';
-                    $GLOBALS['selected'] = $_REQUEST['selected_fld'];
+                    $GLOBALS['selected'] = $_POST['selected_fld'];
                     list(
                         $what_ret, $query_type_ret, $is_unset_submit_mult,
                         $mult_btn_ret, $centralColsError
                         )
                             = $this->getDataForSubmitMult(
                                 $submit_mult,
-                                $_REQUEST['selected_fld'],
+                                $_POST['selected_fld'],
                                 $action
                             );
                     //update the existing variables
@@ -291,29 +291,29 @@ class TableStructureController extends TableController
         /**
          * Modifications have been submitted -> updates the table
          */
-        if (isset($_REQUEST['do_save_data'])) {
+        if (isset($_POST['do_save_data'])) {
             $regenerate = $this->updateColumns();
             if ($regenerate) {
                 // This happens when updating failed
                 // @todo: do something appropriate
             } else {
                 // continue to show the table's structure
-                unset($_REQUEST['selected']);
+                unset($_POST['selected']);
             }
         }
 
         /**
          * Modifications to the partitioning have been submitted -> updates the table
          */
-        if (isset($_REQUEST['save_partitioning'])) {
+        if (isset($_POST['save_partitioning'])) {
             $this->updatePartitioning();
         }
 
         /**
          * Adding indexes
          */
-        if (isset($_REQUEST['add_key'])
-            || isset($_REQUEST['partition_maintenance'])
+        if (isset($_POST['add_key'])
+            || isset($_POST['partition_maintenance'])
         ) {
             //todo: set some variables for sql.php include, to be eliminated
             //after refactoring sql.php
@@ -402,8 +402,8 @@ class TableStructureController extends TableController
         $changes = [];
 
         // move columns from first to last
-        for ($i = 0, $l = count($_REQUEST['move_columns']); $i < $l; $i++) {
-            $column = $_REQUEST['move_columns'][$i];
+        for ($i = 0, $l = count($_POST['move_columns']); $i < $l; $i++) {
+            $column = $_POST['move_columns'][$i];
             // is this column already correctly placed?
             if ($column_names[$i] == $column) {
                 continue;
@@ -568,7 +568,7 @@ class TableStructureController extends TableController
     protected function displayHtmlForPartitionChange()
     {
         $partitionDetails = null;
-        if (! isset($_REQUEST['partition_by'])) {
+        if (! isset($_POST['partition_by'])) {
             $partitionDetails = $this->_extractPartitionDetails();
         }
 
@@ -788,18 +788,18 @@ class TableStructureController extends TableController
         ];
 
         foreach ($types as $type) {
-            if (isset($_REQUEST['submit_mult_' . $type . '_x'])) {
+            if (isset($_POST['submit_mult_' . $type . '_x'])) {
                 return $type;
             }
         }
 
-        if (isset($_REQUEST['submit_mult'])) {
-            return $_REQUEST['submit_mult'];
-        } elseif (isset($_REQUEST['mult_btn'])
-            && $_REQUEST['mult_btn'] == __('Yes')
+        if (isset($_POST['submit_mult'])) {
+            return $_POST['submit_mult'];
+        } elseif (isset($_POST['mult_btn'])
+            && $_POST['mult_btn'] == __('Yes')
         ) {
-            if (isset($_REQUEST['selected'])) {
-                $_REQUEST['selected_fld'] = $_REQUEST['selected'];
+            if (isset($_POST['selected'])) {
+                $_POST['selected_fld'] = $_POST['selected'];
             }
             return 'row_delete';
         }
@@ -819,7 +819,7 @@ class TableStructureController extends TableController
     {
         $GLOBALS['active_page'] = 'sql.php';
         $fields = [];
-        foreach ($_REQUEST['selected_fld'] as $sval) {
+        foreach ($_POST['selected_fld'] as $sval) {
             $fields[] = Util::backquote($sval);
         }
         $sql_query = sprintf(
@@ -877,7 +877,7 @@ class TableStructureController extends TableController
             ]
         );
         $regenerate = false;
-        $field_cnt = count($_REQUEST['field_name']);
+        $field_cnt = count($_POST['field_name']);
         $changes = [];
         $adjust_privileges = [];
         $columns_with_index = $this->dbi
@@ -891,20 +891,20 @@ class TableStructureController extends TableController
             }
 
             $changes[] = 'CHANGE ' . Table::generateAlter(
-                Util::getValueByKey($_REQUEST, "field_orig.${i}", ''),
-                $_REQUEST['field_name'][$i],
-                $_REQUEST['field_type'][$i],
-                $_REQUEST['field_length'][$i],
-                $_REQUEST['field_attribute'][$i],
-                Util::getValueByKey($_REQUEST, "field_collation.${i}", ''),
-                Util::getValueByKey($_REQUEST, "field_null.${i}", 'NOT NULL'),
-                $_REQUEST['field_default_type'][$i],
-                $_REQUEST['field_default_value'][$i],
-                Util::getValueByKey($_REQUEST, "field_extra.${i}", false),
-                Util::getValueByKey($_REQUEST, "field_comments.${i}", ''),
-                Util::getValueByKey($_REQUEST, "field_virtuality.${i}", ''),
-                Util::getValueByKey($_REQUEST, "field_expression.${i}", ''),
-                Util::getValueByKey($_REQUEST, "field_move_to.${i}", ''),
+                Util::getValueByKey($_POST, "field_orig.${i}", ''),
+                $_POST['field_name'][$i],
+                $_POST['field_type'][$i],
+                $_POST['field_length'][$i],
+                $_POST['field_attribute'][$i],
+                Util::getValueByKey($_POST, "field_collation.${i}", ''),
+                Util::getValueByKey($_POST, "field_null.${i}", 'NOT NULL'),
+                $_POST['field_default_type'][$i],
+                $_POST['field_default_value'][$i],
+                Util::getValueByKey($_POST, "field_extra.${i}", false),
+                Util::getValueByKey($_POST, "field_comments.${i}", ''),
+                Util::getValueByKey($_POST, "field_virtuality.${i}", ''),
+                Util::getValueByKey($_POST, "field_expression.${i}", ''),
+                Util::getValueByKey($_POST, "field_move_to.${i}", ''),
                 $columns_with_index
             );
 
@@ -915,22 +915,22 @@ class TableStructureController extends TableController
             // if the old column name is part of the remembered sort expression
             if (mb_strpos(
                 (string) $sorted_col,
-                Util::backquote($_REQUEST['field_orig'][$i])
+                Util::backquote($_POST['field_orig'][$i])
             ) !== false) {
                 // delete the whole remembered sort expression
                 $this->table_obj->removeUiProp(Table::PROP_SORTED_COLUMN);
             }
 
-            if (isset($_REQUEST['field_adjust_privileges'][$i])
-                && ! empty($_REQUEST['field_adjust_privileges'][$i])
-                && $_REQUEST['field_orig'][$i] != $_REQUEST['field_name'][$i]
+            if (isset($_POST['field_adjust_privileges'][$i])
+                && ! empty($_POST['field_adjust_privileges'][$i])
+                && $_POST['field_orig'][$i] != $_POST['field_name'][$i]
             ) {
-                $adjust_privileges[$_REQUEST['field_orig'][$i]]
-                    = $_REQUEST['field_name'][$i];
+                $adjust_privileges[$_POST['field_orig'][$i]]
+                    = $_POST['field_name'][$i];
             }
         } // end for
 
-        if (count($changes) > 0 || isset($_REQUEST['preview_sql'])) {
+        if (count($changes) > 0 || isset($_POST['preview_sql'])) {
             // Builds the primary keys statements and updates the table
             $key_query = '';
             /**
@@ -957,7 +957,7 @@ class TableStructureController extends TableController
             $sql_query .= ';';
 
             // If there is a request for SQL previewing.
-            if (isset($_REQUEST['preview_sql'])) {
+            if (isset($_POST['preview_sql'])) {
                 Core::previewSQL(count($changes) > 0 ? $sql_query : '');
             }
 
@@ -972,18 +972,18 @@ class TableStructureController extends TableController
             // While changing the Column Collation
             // First change to BLOB
             for ($i = 0; $i < $field_cnt; $i++) {
-                if (isset($_REQUEST['field_collation'][$i])
-                    && isset($_REQUEST['field_collation_orig'][$i])
-                    && $_REQUEST['field_collation'][$i] !== $_REQUEST['field_collation_orig'][$i]
-                    && ! in_array($_REQUEST['field_orig'][$i], $columns_with_index)
+                if (isset($_POST['field_collation'][$i])
+                    && isset($_POST['field_collation_orig'][$i])
+                    && $_POST['field_collation'][$i] !== $_POST['field_collation_orig'][$i]
+                    && ! in_array($_POST['field_orig'][$i], $columns_with_index)
                 ) {
                     $secondary_query = 'ALTER TABLE ' . Util::backquote(
                         $this->table
                     )
                     . ' CHANGE ' . Util::backquote(
-                        $_REQUEST['field_orig'][$i]
+                        $_POST['field_orig'][$i]
                     )
-                    . ' ' . Util::backquote($_REQUEST['field_orig'][$i])
+                    . ' ' . Util::backquote($_POST['field_orig'][$i])
                     . ' BLOB;';
                     $this->dbi->query($secondary_query);
                     $changedToBlob[$i] = true;
@@ -1028,20 +1028,20 @@ class TableStructureController extends TableController
                 for ($i = 0; $i < $field_cnt; $i++) {
                     if ($changedToBlob[$i]) {
                         $changes_revert[] = 'CHANGE ' . Table::generateAlter(
-                            Util::getValueByKey($_REQUEST, "field_orig.${i}", ''),
-                            $_REQUEST['field_name'][$i],
-                            $_REQUEST['field_type_orig'][$i],
-                            $_REQUEST['field_length_orig'][$i],
-                            $_REQUEST['field_attribute_orig'][$i],
-                            Util::getValueByKey($_REQUEST, "field_collation_orig.${i}", ''),
-                            Util::getValueByKey($_REQUEST, "field_null_orig.${i}", 'NOT NULL'),
-                            $_REQUEST['field_default_type_orig'][$i],
-                            $_REQUEST['field_default_value_orig'][$i],
-                            Util::getValueByKey($_REQUEST, "field_extra_orig.${i}", false),
-                            Util::getValueByKey($_REQUEST, "field_comments_orig.${i}", ''),
-                            Util::getValueByKey($_REQUEST, "field_virtuality_orig.${i}", ''),
-                            Util::getValueByKey($_REQUEST, "field_expression_orig.${i}", ''),
-                            Util::getValueByKey($_REQUEST, "field_move_to_orig.${i}", '')
+                            Util::getValueByKey($_POST, "field_orig.${i}", ''),
+                            $_POST['field_name'][$i],
+                            $_POST['field_type_orig'][$i],
+                            $_POST['field_length_orig'][$i],
+                            $_POST['field_attribute_orig'][$i],
+                            Util::getValueByKey($_POST, "field_collation_orig.${i}", ''),
+                            Util::getValueByKey($_POST, "field_null_orig.${i}", 'NOT NULL'),
+                            $_POST['field_default_type_orig'][$i],
+                            $_POST['field_default_value_orig'][$i],
+                            Util::getValueByKey($_POST, "field_extra_orig.${i}", false),
+                            Util::getValueByKey($_POST, "field_comments_orig.${i}", ''),
+                            Util::getValueByKey($_POST, "field_virtuality_orig.${i}", ''),
+                            Util::getValueByKey($_POST, "field_expression_orig.${i}", ''),
+                            Util::getValueByKey($_POST, "field_move_to_orig.${i}", '')
                         );
                     }
                 }
@@ -1066,37 +1066,37 @@ class TableStructureController extends TableController
         }
 
         // update field names in relation
-        if (isset($_REQUEST['field_orig']) && is_array($_REQUEST['field_orig'])) {
-            foreach ($_REQUEST['field_orig'] as $fieldindex => $fieldcontent) {
-                if ($_REQUEST['field_name'][$fieldindex] != $fieldcontent) {
+        if (isset($_POST['field_orig']) && is_array($_POST['field_orig'])) {
+            foreach ($_POST['field_orig'] as $fieldindex => $fieldcontent) {
+                if ($_POST['field_name'][$fieldindex] != $fieldcontent) {
                     $this->relation->renameField(
                         $this->db,
                         $this->table,
                         $fieldcontent,
-                        $_REQUEST['field_name'][$fieldindex]
+                        $_POST['field_name'][$fieldindex]
                     );
                 }
             }
         }
 
         // update mime types
-        if (isset($_REQUEST['field_mimetype'])
-            && is_array($_REQUEST['field_mimetype'])
+        if (isset($_POST['field_mimetype'])
+            && is_array($_POST['field_mimetype'])
             && $GLOBALS['cfg']['BrowseMIME']
         ) {
-            foreach ($_REQUEST['field_mimetype'] as $fieldindex => $mimetype) {
-                if (isset($_REQUEST['field_name'][$fieldindex])
-                    && strlen($_REQUEST['field_name'][$fieldindex]) > 0
+            foreach ($_POST['field_mimetype'] as $fieldindex => $mimetype) {
+                if (isset($_POST['field_name'][$fieldindex])
+                    && strlen($_POST['field_name'][$fieldindex]) > 0
                 ) {
                     $this->transformations->setMime(
                         $this->db,
                         $this->table,
-                        $_REQUEST['field_name'][$fieldindex],
+                        $_POST['field_name'][$fieldindex],
                         $mimetype,
-                        $_REQUEST['field_transformation'][$fieldindex],
-                        $_REQUEST['field_transformation_options'][$fieldindex],
-                        $_REQUEST['field_input_transformation'][$fieldindex],
-                        $_REQUEST['field_input_transformation_options'][$fieldindex]
+                        $_POST['field_transformation'][$fieldindex],
+                        $_POST['field_transformation_options'][$fieldindex],
+                        $_POST['field_input_transformation'][$fieldindex],
+                        $_POST['field_input_transformation_options'][$fieldindex]
                     );
                 }
             }
@@ -1163,15 +1163,15 @@ class TableStructureController extends TableController
     {
         // these two fields are checkboxes so might not be part of the
         // request; therefore we define them to avoid notices below
-        if (! isset($_REQUEST['field_null'][$i])) {
-            $_REQUEST['field_null'][$i] = 'NO';
+        if (! isset($_POST['field_null'][$i])) {
+            $_POST['field_null'][$i] = 'NO';
         }
-        if (! isset($_REQUEST['field_extra'][$i])) {
-            $_REQUEST['field_extra'][$i] = '';
+        if (! isset($_POST['field_extra'][$i])) {
+            $_POST['field_extra'][$i] = '';
         }
 
         // field_name does not follow the convention (corresponds to field_orig)
-        if ($_REQUEST['field_name'][$i] != $_REQUEST['field_orig'][$i]) {
+        if ($_POST['field_name'][$i] != $_POST['field_orig'][$i]) {
             return true;
         }
 
@@ -1181,11 +1181,11 @@ class TableStructureController extends TableController
             'field_length', 'field_null', 'field_type'
         ];
         foreach ($fields as $field) {
-            if ($_REQUEST[$field][$i] != $_REQUEST[$field . '_orig'][$i]) {
+            if ($_POST[$field][$i] != $_POST[$field . '_orig'][$i]) {
                 return true;
             }
         }
-        return !empty($_REQUEST['field_move_to'][$i]);
+        return !empty($_POST['field_move_to'][$i]);
     }
 
     /**
diff --git a/libraries/classes/CreateAddField.php b/libraries/classes/CreateAddField.php
index 86a7baf96d..fdb8f4a092 100644
--- a/libraries/classes/CreateAddField.php
+++ b/libraries/classes/CreateAddField.php
@@ -38,12 +38,12 @@ class CreateAddField
      */
     private function getIndexedColumns(): array
     {
-        $fieldCount = count($_REQUEST['field_name']);
-        $fieldPrimary = json_decode($_REQUEST['primary_indexes'], true);
-        $fieldIndex = json_decode($_REQUEST['indexes'], true);
-        $fieldUnique = json_decode($_REQUEST['unique_indexes'], true);
-        $fieldFullText = json_decode($_REQUEST['fulltext_indexes'], true);
-        $fieldSpatial = json_decode($_REQUEST['spatial_indexes'], true);
+        $fieldCount = count($_POST['field_name']);
+        $fieldPrimary = json_decode($_POST['primary_indexes'], true);
+        $fieldIndex = json_decode($_POST['indexes'], true);
+        $fieldUnique = json_decode($_POST['unique_indexes'], true);
+        $fieldFullText = json_decode($_POST['fulltext_indexes'], true);
+        $fieldSpatial = json_decode($_POST['spatial_indexes'], true);
 
         return [
             $fieldCount,
@@ -74,35 +74,35 @@ class CreateAddField
         $previousField = -1;
         for ($i = 0; $i < $fieldCount; ++$i) {
             // '0' is also empty for php :-(
-            if (strlen($_REQUEST['field_name'][$i]) === 0) {
+            if (strlen($_POST['field_name'][$i]) === 0) {
                 continue;
             }
 
             $definition = $this->getStatementPrefix($isCreateTable) .
                     Table::generateFieldSpec(
-                        trim($_REQUEST['field_name'][$i]),
-                        $_REQUEST['field_type'][$i],
-                        $_REQUEST['field_length'][$i],
-                        $_REQUEST['field_attribute'][$i],
-                        isset($_REQUEST['field_collation'][$i])
-                        ? $_REQUEST['field_collation'][$i]
+                        trim($_POST['field_name'][$i]),
+                        $_POST['field_type'][$i],
+                        $_POST['field_length'][$i],
+                        $_POST['field_attribute'][$i],
+                        isset($_POST['field_collation'][$i])
+                        ? $_POST['field_collation'][$i]
                         : '',
-                        isset($_REQUEST['field_null'][$i])
-                        ? $_REQUEST['field_null'][$i]
+                        isset($_POST['field_null'][$i])
+                        ? $_POST['field_null'][$i]
                         : 'NOT NULL',
-                        $_REQUEST['field_default_type'][$i],
-                        $_REQUEST['field_default_value'][$i],
-                        isset($_REQUEST['field_extra'][$i])
-                        ? $_REQUEST['field_extra'][$i]
+                        $_POST['field_default_type'][$i],
+                        $_POST['field_default_value'][$i],
+                        isset($_POST['field_extra'][$i])
+                        ? $_POST['field_extra'][$i]
                         : false,
-                        isset($_REQUEST['field_comments'][$i])
-                        ? $_REQUEST['field_comments'][$i]
+                        isset($_POST['field_comments'][$i])
+                        ? $_POST['field_comments'][$i]
                         : '',
-                        isset($_REQUEST['field_virtuality'][$i])
-                        ? $_REQUEST['field_virtuality'][$i]
+                        isset($_POST['field_virtuality'][$i])
+                        ? $_POST['field_virtuality'][$i]
                         : '',
-                        isset($_REQUEST['field_expression'][$i])
-                        ? $_REQUEST['field_expression'][$i]
+                        isset($_POST['field_expression'][$i])
+                        ? $_POST['field_expression'][$i]
                         : ''
                     );
 
@@ -136,22 +136,22 @@ class CreateAddField
             return $sqlSuffix;
         }
 
-        if ((string) $_REQUEST['field_where'] === 'last') {
+        if ((string) $_POST['field_where'] === 'last') {
             return $sqlSuffix;
         }
 
         // Only the first field can be added somewhere other than at the end
         if ($previousField == -1) {
-            if ((string) $_REQUEST['field_where'] === 'first') {
+            if ((string) $_POST['field_where'] === 'first') {
                 $sqlSuffix .= ' FIRST';
             } else {
                 $sqlSuffix .= ' AFTER '
-                        . Util::backquote($_REQUEST['after_field']);
+                        . Util::backquote($_POST['after_field']);
             }
         } else {
             $sqlSuffix .= ' AFTER '
                     . Util::backquote(
-                        $_REQUEST['field_name'][$previousField]
+                        $_POST['field_name'][$previousField]
                     );
         }
 
@@ -189,7 +189,7 @@ class CreateAddField
         $indexFields = [];
         foreach ($index['columns'] as $key => $column) {
             $indexFields[$key] = Util::backquote(
-                $_REQUEST['field_name'][$column['col_index']]
+                $_POST['field_name'][$column['col_index']]
             );
             if ($column['size']) {
                 $indexFields[$key] .= '(' . $column['size'] . ')';
@@ -353,30 +353,30 @@ class CreateAddField
     public function getPartitionsDefinition(): string
     {
         $sqlQuery = "";
-        if (! empty($_REQUEST['partition_by'])
-            && ! empty($_REQUEST['partition_expr'])
-            && ! empty($_REQUEST['partition_count'])
-            && $_REQUEST['partition_count'] > 1
+        if (! empty($_POST['partition_by'])
+            && ! empty($_POST['partition_expr'])
+            && ! empty($_POST['partition_count'])
+            && $_POST['partition_count'] > 1
         ) {
-            $sqlQuery .= " PARTITION BY " . $_REQUEST['partition_by']
-                . " (" . $_REQUEST['partition_expr'] . ")"
-                . " PARTITIONS " . $_REQUEST['partition_count'];
+            $sqlQuery .= " PARTITION BY " . $_POST['partition_by']
+                . " (" . $_POST['partition_expr'] . ")"
+                . " PARTITIONS " . $_POST['partition_count'];
         }
 
-        if (! empty($_REQUEST['subpartition_by'])
-            && ! empty($_REQUEST['subpartition_expr'])
-            && ! empty($_REQUEST['subpartition_count'])
-            && $_REQUEST['subpartition_count'] > 1
+        if (! empty($_POST['subpartition_by'])
+            && ! empty($_POST['subpartition_expr'])
+            && ! empty($_POST['subpartition_count'])
+            && $_POST['subpartition_count'] > 1
         ) {
-            $sqlQuery .= " SUBPARTITION BY " . $_REQUEST['subpartition_by']
-               . " (" . $_REQUEST['subpartition_expr'] . ")"
-               . " SUBPARTITIONS " . $_REQUEST['subpartition_count'];
+            $sqlQuery .= " SUBPARTITION BY " . $_POST['subpartition_by']
+               . " (" . $_POST['subpartition_expr'] . ")"
+               . " SUBPARTITIONS " . $_POST['subpartition_count'];
         }
 
-        if (! empty($_REQUEST['partitions'])) {
+        if (! empty($_POST['partitions'])) {
             $i = 0;
             $partitions = [];
-            foreach ($_REQUEST['partitions'] as $partition) {
+            foreach ($_POST['partitions'] as $partition) {
                 $partitions[] = $this->getPartitionDefinition($partition);
                 $i++;
             }
@@ -468,24 +468,24 @@ class CreateAddField
             . Util::backquote(trim($table)) . ' (' . $sqlStatement . ')';
 
         // Adds table type, character set, comments and partition definition
-        if (!empty($_REQUEST['tbl_storage_engine'])
-            && ($_REQUEST['tbl_storage_engine'] != 'Default')
+        if (!empty($_POST['tbl_storage_engine'])
+            && ($_POST['tbl_storage_engine'] != 'Default')
         ) {
-            $sqlQuery .= ' ENGINE = ' . $_REQUEST['tbl_storage_engine'];
+            $sqlQuery .= ' ENGINE = ' . $_POST['tbl_storage_engine'];
         }
-        if (!empty($_REQUEST['tbl_collation'])) {
-            $sqlQuery .= Util::getCharsetQueryPart($_REQUEST['tbl_collation']);
+        if (!empty($_POST['tbl_collation'])) {
+            $sqlQuery .= Util::getCharsetQueryPart($_POST['tbl_collation']);
         }
-        if (! empty($_REQUEST['connection'])
-            && ! empty($_REQUEST['tbl_storage_engine'])
-            && $_REQUEST['tbl_storage_engine'] == 'FEDERATED'
+        if (! empty($_POST['connection'])
+            && ! empty($_POST['tbl_storage_engine'])
+            && $_POST['tbl_storage_engine'] == 'FEDERATED'
         ) {
             $sqlQuery .= " CONNECTION = '"
-                . $this->dbi->escapeString($_REQUEST['connection']) . "'";
+                . $this->dbi->escapeString($_POST['connection']) . "'";
         }
-        if (!empty($_REQUEST['comment'])) {
+        if (!empty($_POST['comment'])) {
             $sqlQuery .= ' COMMENT = \''
-                . $this->dbi->escapeString($_REQUEST['comment']) . '\'';
+                . $this->dbi->escapeString($_POST['comment']) . '\'';
         }
         $sqlQuery .= $this->getPartitionsDefinition();
         $sqlQuery .= ';';
@@ -503,14 +503,14 @@ class CreateAddField
         // Limit to 4096 fields (MySQL maximal value)
         $mysqlLimit = 4096;
 
-        if (isset($_REQUEST['submit_num_fields'])) { // adding new fields
-            $numberOfFields = intval($_REQUEST['orig_num_fields']) + intval($_REQUEST['added_fields']);
-        } elseif (isset($_REQUEST['orig_num_fields'])) { // retaining existing fields
-            $numberOfFields = intval($_REQUEST['orig_num_fields']);
-        } elseif (isset($_REQUEST['num_fields'])
-            && intval($_REQUEST['num_fields']) > 0
+        if (isset($_POST['submit_num_fields'])) { // adding new fields
+            $numberOfFields = intval($_POST['orig_num_fields']) + intval($_POST['added_fields']);
+        } elseif (isset($_POST['orig_num_fields'])) { // retaining existing fields
+            $numberOfFields = intval($_POST['orig_num_fields']);
+        } elseif (isset($_POST['num_fields'])
+            && intval($_POST['num_fields']) > 0
         ) { // new table with specified number of fields
-            $numberOfFields = intval($_REQUEST['num_fields']);
+            $numberOfFields = intval($_POST['num_fields']);
         } else { // new table with unspecified number of fields
             $numberOfFields = 4;
         }
@@ -548,7 +548,7 @@ class CreateAddField
         $sqlQuery = 'ALTER TABLE ' .
             Util::backquote($table) . ' ' . $sqlStatement . ';';
         // If there is a request for SQL previewing.
-        if (isset($_REQUEST['preview_sql'])) {
+        if (isset($_POST['preview_sql'])) {
             Core::previewSQL($sqlQuery);
         }
         return [$this->dbi->tryQuery($sqlQuery), $sqlQuery];
diff --git a/libraries/classes/Database/Qbe.php b/libraries/classes/Database/Qbe.php
index 1b0b5006d5..d2c8db86e6 100644
--- a/libraries/classes/Database/Qbe.php
+++ b/libraries/classes/Database/Qbe.php
@@ -271,7 +271,7 @@ class Qbe
         }
 
         $criterias = $this->_currentSearch->getCriterias();
-        $_REQUEST = $criterias + $_REQUEST;
+        $_POST = $criterias + $_POST;
 
         return $this;
     }
@@ -296,34 +296,34 @@ class Qbe
         $criteriaColumnCount = $this->_initializeCriteriasCount();
 
         $this->_criteriaColumnInsert = Core::ifSetOr(
-            $_REQUEST['criteriaColumnInsert'],
+            $_POST['criteriaColumnInsert'],
             null,
             'array'
         );
         $this->_criteriaColumnDelete = Core::ifSetOr(
-            $_REQUEST['criteriaColumnDelete'],
+            $_POST['criteriaColumnDelete'],
             null,
             'array'
         );
 
-        $this->_prev_criteria = isset($_REQUEST['prev_criteria'])
-            ? $_REQUEST['prev_criteria']
+        $this->_prev_criteria = isset($_POST['prev_criteria'])
+            ? $_POST['prev_criteria']
             : [];
-        $this->_criteria = isset($_REQUEST['criteria'])
-            ? $_REQUEST['criteria']
+        $this->_criteria = isset($_POST['criteria'])
+            ? $_POST['criteria']
             : array_fill(0, $criteriaColumnCount, '');
 
-        $this->_criteriaRowInsert = isset($_REQUEST['criteriaRowInsert'])
-            ? $_REQUEST['criteriaRowInsert']
+        $this->_criteriaRowInsert = isset($_POST['criteriaRowInsert'])
+            ? $_POST['criteriaRowInsert']
             : array_fill(0, $criteriaColumnCount, '');
-        $this->_criteriaRowDelete = isset($_REQUEST['criteriaRowDelete'])
-            ? $_REQUEST['criteriaRowDelete']
+        $this->_criteriaRowDelete = isset($_POST['criteriaRowDelete'])
+            ? $_POST['criteriaRowDelete']
             : array_fill(0, $criteriaColumnCount, '');
-        $this->_criteriaAndOrRow = isset($_REQUEST['criteriaAndOrRow'])
-            ? $_REQUEST['criteriaAndOrRow']
+        $this->_criteriaAndOrRow = isset($_POST['criteriaAndOrRow'])
+            ? $_POST['criteriaAndOrRow']
             : array_fill(0, $criteriaColumnCount, '');
-        $this->_criteriaAndOrColumn = isset($_REQUEST['criteriaAndOrColumn'])
-            ? $_REQUEST['criteriaAndOrColumn']
+        $this->_criteriaAndOrColumn = isset($_POST['criteriaAndOrColumn'])
+            ? $_POST['criteriaAndOrColumn']
             : array_fill(0, $criteriaColumnCount, '');
         // sets minimum width
         $this->_form_column_width = 12;
@@ -343,8 +343,8 @@ class Qbe
     private function _setCriteriaTablesAndColumns()
     {
         // The tables list sent by a previously submitted form
-        if (Core::isValid($_REQUEST['TableList'], 'array')) {
-            foreach ($_REQUEST['TableList'] as $each_table) {
+        if (Core::isValid($_POST['TableList'], 'array')) {
+            foreach ($_POST['TableList'] as $each_table) {
                 $this->_criteriaTables[$each_table] = ' selected="selected"';
             }
         } // end if
@@ -363,7 +363,7 @@ class Qbe
             $columns = $this->dbi->getColumns($this->_db, $table);
 
             if (empty($this->_criteriaTables[$table])
-                && ! empty($_REQUEST['TableList'])
+                && ! empty($_POST['TableList'])
             ) {
                 $this->_criteriaTables[$table] = '';
             } else {
@@ -490,10 +490,10 @@ class Qbe
                 continue;
             }
             $selected = '';
-            if (isset($_REQUEST['criteriaColumn'][$column_index])) {
-                $selected = $_REQUEST['criteriaColumn'][$column_index];
+            if (isset($_POST['criteriaColumn'][$column_index])) {
+                $selected = $_POST['criteriaColumn'][$column_index];
                 $this->_formColumns[$new_column_count]
-                    = $_REQUEST['criteriaColumn'][$column_index];
+                    = $_POST['criteriaColumn'][$column_index];
             }
             $html_output .= $this->_showColumnSelectCell(
                 $new_column_count,
@@ -539,10 +539,10 @@ class Qbe
             }
 
             $tmp_alias = '';
-            if (! empty($_REQUEST['criteriaAlias'][$colInd])) {
+            if (! empty($_POST['criteriaAlias'][$colInd])) {
                 $tmp_alias
                     = $this->_formAliases[$new_column_count]
-                        = $_REQUEST['criteriaAlias'][$colInd];
+                        = $_POST['criteriaAlias'][$colInd];
             }// end if
 
             $html_output .= '<td class="center">';
@@ -586,21 +586,21 @@ class Qbe
             }
             // If they have chosen all fields using the * selector,
             // then sorting is not available, Fix for Bug #570698
-            if (isset($_REQUEST['criteriaSort'][$colInd])
-                && isset($_REQUEST['criteriaColumn'][$colInd])
-                && mb_substr($_REQUEST['criteriaColumn'][$colInd], -2) == '.*'
+            if (isset($_POST['criteriaSort'][$colInd])
+                && isset($_POST['criteriaColumn'][$colInd])
+                && mb_substr($_POST['criteriaColumn'][$colInd], -2) == '.*'
             ) {
-                $_REQUEST['criteriaSort'][$colInd] = '';
+                $_POST['criteriaSort'][$colInd] = '';
             } //end if
 
             $selected = '';
-            if (isset($_REQUEST['criteriaSort'][$colInd])) {
+            if (isset($_POST['criteriaSort'][$colInd])) {
                 $this->_formSorts[$new_column_count]
-                    = $_REQUEST['criteriaSort'][$colInd];
+                    = $_POST['criteriaSort'][$colInd];
 
-                if ($_REQUEST['criteriaSort'][$colInd] == 'ASC') {
+                if ($_POST['criteriaSort'][$colInd] == 'ASC') {
                     $selected = 'ASC';
-                } elseif ($_REQUEST['criteriaSort'][$colInd] == 'DESC') {
+                } elseif ($_POST['criteriaSort'][$colInd] == 'DESC') {
                     $selected = 'DESC';
                 }
             } else {
@@ -650,10 +650,10 @@ class Qbe
             }
 
             $sortOrder = null;
-            if (! empty($_REQUEST['criteriaSortOrder'][$colInd])) {
+            if (! empty($_POST['criteriaSortOrder'][$colInd])) {
                 $sortOrder
                     = $this->_formSortOrders[$new_column_count]
-                        = $_REQUEST['criteriaSortOrder'][$colInd];
+                        = $_POST['criteriaSortOrder'][$colInd];
             }
 
             $html_output .= $this->_getSortOrderSelectCell(
@@ -695,10 +695,10 @@ class Qbe
             ) {
                 continue;
             }
-            if (isset($_REQUEST['criteriaShow'][$column_index])) {
+            if (isset($_POST['criteriaShow'][$column_index])) {
                 $checked_options = ' checked="checked"';
                 $this->_formShows[$new_column_count]
-                    = $_REQUEST['criteriaShow'][$column_index];
+                    = $_POST['criteriaShow'][$column_index];
             } else {
                 $checked_options = '';
             }
@@ -1014,8 +1014,8 @@ class Qbe
                 continue;
             }
             $or = 'Or' . $new_row_index;
-            if (! empty($_REQUEST[$or]) && isset($_REQUEST[$or][$column_index])) {
-                $tmp_or = $_REQUEST[$or][$column_index];
+            if (! empty($_POST[$or]) && isset($_POST[$or][$column_index])) {
+                $tmp_or = $_POST[$or][$column_index];
             } else {
                 $tmp_or     = '';
             }
@@ -1176,7 +1176,7 @@ class Qbe
             $column_index < $this->_criteria_column_count;
             $column_index++) {
                 if (! empty($this->_formColumns[$column_index])
-                    && ! empty($_REQUEST['Or' . $row_index][$column_index])
+                    && ! empty($_POST['Or' . $row_index][$column_index])
                     && $column_index
                 ) {
                     $qry_orwhere .= ' '
@@ -1186,11 +1186,11 @@ class Qbe
                         . ' ';
                 }
                 if (! empty($this->_formColumns[$column_index])
-                    && ! empty($_REQUEST['Or' . $row_index][$column_index])
+                    && ! empty($_POST['Or' . $row_index][$column_index])
                 ) {
                     $qry_orwhere .= '(' . $this->_formColumns[$column_index]
                         . ' '
-                        . $_REQUEST['Or' . $row_index][$column_index]
+                        . $_POST['Or' . $row_index][$column_index]
                         . ')';
                     $last_orwhere = $column_index;
                     $criteria_cnt++;
@@ -1913,12 +1913,12 @@ class Qbe
     {
         // sets column count
         $criteriaColumnCount = Core::ifSetOr(
-            $_REQUEST['criteriaColumnCount'],
+            $_POST['criteriaColumnCount'],
             3,
             'numeric'
         );
         $criteriaColumnAdd = Core::ifSetOr(
-            $_REQUEST['criteriaColumnAdd'],
+            $_POST['criteriaColumnAdd'],
             0,
             'numeric'
         );
@@ -1928,8 +1928,8 @@ class Qbe
         );
 
         // sets row count
-        $rows = Core::ifSetOr($_REQUEST['rows'], 0, 'numeric');
-        $criteriaRowAdd = Core::ifSetOr($_REQUEST['criteriaRowAdd'], 0, 'numeric');
+        $rows = Core::ifSetOr($_POST['rows'], 0, 'numeric');
+        $criteriaRowAdd = Core::ifSetOr($_POST['criteriaRowAdd'], 0, 'numeric');
         $this->_criteria_row_count = min(
             100,
             max($rows + $criteriaRowAdd, 0)
diff --git a/libraries/classes/Database/Search.php b/libraries/classes/Database/Search.php
index e6dfd32a44..69396af444 100644
--- a/libraries/classes/Database/Search.php
+++ b/libraries/classes/Database/Search.php
@@ -125,49 +125,49 @@ class Search
     {
         $this->tablesNamesOnly = $this->dbi->getTables($this->db);
 
-        if (empty($_REQUEST['criteriaSearchType'])
-            || ! is_string($_REQUEST['criteriaSearchType'])
+        if (empty($_POST['criteriaSearchType'])
+            || ! is_string($_POST['criteriaSearchType'])
             || ! array_key_exists(
-                $_REQUEST['criteriaSearchType'],
+                $_POST['criteriaSearchType'],
                 $this->searchTypes
             )
         ) {
             $this->criteriaSearchType = 1;
-            unset($_REQUEST['submit_search']);
+            unset($_POST['submit_search']);
         } else {
-            $this->criteriaSearchType = (int) $_REQUEST['criteriaSearchType'];
+            $this->criteriaSearchType = (int) $_POST['criteriaSearchType'];
             $this->searchTypeDescription
-                = $this->searchTypes[$_REQUEST['criteriaSearchType']];
+                = $this->searchTypes[$_POST['criteriaSearchType']];
         }
 
-        if (empty($_REQUEST['criteriaSearchString'])
-            || ! is_string($_REQUEST['criteriaSearchString'])
+        if (empty($_POST['criteriaSearchString'])
+            || ! is_string($_POST['criteriaSearchString'])
         ) {
             $this->criteriaSearchString = '';
-            unset($_REQUEST['submit_search']);
+            unset($_POST['submit_search']);
         } else {
-            $this->criteriaSearchString = $_REQUEST['criteriaSearchString'];
+            $this->criteriaSearchString = $_POST['criteriaSearchString'];
         }
 
         $this->criteriaTables = [];
-        if (empty($_REQUEST['criteriaTables'])
-            || ! is_array($_REQUEST['criteriaTables'])
+        if (empty($_POST['criteriaTables'])
+            || ! is_array($_POST['criteriaTables'])
         ) {
-            unset($_REQUEST['submit_search']);
+            unset($_POST['submit_search']);
         } else {
             $this->criteriaTables = array_intersect(
-                $_REQUEST['criteriaTables'],
+                $_POST['criteriaTables'],
                 $this->tablesNamesOnly
             );
         }
 
-        if (empty($_REQUEST['criteriaColumnName'])
-            || ! is_string($_REQUEST['criteriaColumnName'])
+        if (empty($_POST['criteriaColumnName'])
+            || ! is_string($_POST['criteriaColumnName'])
         ) {
             unset($this->criteriaColumnName);
         } else {
             $this->criteriaColumnName = $this->dbi->escapeString(
-                $_REQUEST['criteriaColumnName']
+                $_POST['criteriaColumnName']
             );
         }
     }
diff --git a/libraries/classes/Display/Export.php b/libraries/classes/Display/Export.php
index 88080c71d5..421b6a3f50 100644
--- a/libraries/classes/Display/Export.php
+++ b/libraries/classes/Display/Export.php
@@ -69,11 +69,11 @@ class Export
      */
     public function getHtmlForSelectOptions($tmpSelect = '')
     {
-        // Check if the selected databases are defined in $_GET
+        // Check if the selected databases are defined in $_POST
         // (from clicking Back button on export.php)
-        if (isset($_GET['db_select'])) {
-            $_GET['db_select'] = urldecode($_GET['db_select']);
-            $_GET['db_select'] = explode(",", $_GET['db_select']);
+        if (isset($_POST['db_select'])) {
+            $_POST['db_select'] = urldecode($_POST['db_select']);
+            $_POST['db_select'] = explode(",", $_POST['db_select']);
         }
 
         $databases = [];
@@ -82,8 +82,8 @@ class Export
                 continue;
             }
             $isSelected = false;
-            if (isset($_GET['db_select'])) {
-                if (in_array($currentDb, $_GET['db_select'])) {
+            if (isset($_POST['db_select'])) {
+                if (in_array($currentDb, $_POST['db_select'])) {
                     $isSelected = true;
                 }
             } elseif (!empty($tmpSelect)) {
@@ -128,14 +128,14 @@ class Export
         global $cfg;
 
         // If the export method was not set, the default is quick
-        if (isset($_GET['export_method'])) {
-            $cfg['Export']['method'] = $_GET['export_method'];
+        if (isset($_POST['export_method'])) {
+            $cfg['Export']['method'] = $_POST['export_method'];
         } elseif (! isset($cfg['Export']['method'])) {
             $cfg['Export']['method'] = 'quick';
         }
 
-        if (empty($sqlQuery) && isset($_GET['sql_query'])) {
-            $sqlQuery = $_GET['sql_query'];
+        if (empty($sqlQuery) && isset($_POST['sql_query'])) {
+            $sqlQuery = $_POST['sql_query'];
         }
 
         return $this->template->render('display/export/hidden_inputs', [
@@ -145,7 +145,7 @@ class Export
             'export_method' => $cfg['Export']['method'],
             'single_table' => $singleTable,
             'sql_query' => $sqlQuery,
-            'template_id' => isset($_GET['template_id']) ? $_GET['template_id'] : '',
+            'template_id' => isset($_POST['template_id']) ? $_POST['template_id'] : '',
         ]);
     }
 
@@ -183,7 +183,7 @@ class Export
 
         return $this->template->render('display/export/template_options', [
             'templates' => $templates,
-            'selected_template' => !empty($_GET['template_id']) ? $_GET['template_id'] : null,
+            'selected_template' => !empty($_POST['template_id']) ? $_POST['template_id'] : null,
         ]);
     }
 
@@ -195,8 +195,8 @@ class Export
     private function getHtmlForOptionsMethod()
     {
         global $cfg;
-        if (isset($_GET['quick_or_custom'])) {
-            $exportMethod = $_GET['quick_or_custom'];
+        if (isset($_POST['quick_or_custom'])) {
+            $exportMethod = $_POST['quick_or_custom'];
         } else {
             $exportMethod = $cfg['Export']['method'];
         }
@@ -271,9 +271,9 @@ class Export
         $numberOfRows = $tableObject->countRecords();
 
         return $this->template->render('display/export/options_rows', [
-            'allrows' => isset($_GET['allrows']) ? $_GET['allrows'] : null,
-            'limit_to' => isset($_GET['limit_to']) ? $_GET['limit_to'] : null,
-            'limit_from' => isset($_GET['limit_from']) ? $_GET['limit_from'] : null,
+            'allrows' => isset($_POST['allrows']) ? $_POST['allrows'] : null,
+            'limit_to' => isset($_POST['limit_to']) ? $_POST['limit_to'] : null,
+            'limit_from' => isset($_POST['limit_from']) ? $_POST['limit_from'] : null,
             'unlim_num_rows' => $unlimNumRows,
             'number_of_rows' => $numberOfRows,
         ]);
@@ -364,8 +364,8 @@ class Export
         );
         $msg->addParamHtml('</a>');
 
-        if (isset($_GET['filename_template'])) {
-            $filenameTemplate = $_GET['filename_template'];
+        if (isset($_POST['filename_template'])) {
+            $filenameTemplate = $_POST['filename_template'];
         } else {
             if ($exportType == 'database') {
                 $filenameTemplate = $GLOBALS['PMA_Config']->getUserValue(
@@ -415,8 +415,8 @@ class Export
     private function getHtmlForOptionsOutputCompression()
     {
         global $cfg;
-        if (isset($_GET['compression'])) {
-            $selectedCompression = $_GET['compression'];
+        if (isset($_POST['compression'])) {
+            $selectedCompression = $_POST['compression'];
         } elseif (isset($cfg['Export']['compression'])) {
             $selectedCompression = $cfg['Export']['compression'];
         } else {
@@ -449,7 +449,7 @@ class Export
     private function getHtmlForOptionsOutputRadio()
     {
         return $this->template->render('display/export/options_output_radio', [
-            'has_repopulate' => isset($_GET['repopulate']),
+            'has_repopulate' => isset($_POST['repopulate']),
             'export_asfile' => $GLOBALS['cfg']['Export']['asfile'],
         ]);
     }
@@ -512,8 +512,8 @@ class Export
             'export_type' => $exportType,
             'is_checked_lock_tables' => $isCheckedLockTables,
             'is_checked_asfile' => $isCheckedAsfile,
-            'repopulate' => isset($_GET['repopulate']),
-            'lock_tables' => isset($_GET['lock_tables']),
+            'repopulate' => isset($_POST['repopulate']),
+            'lock_tables' => isset($_POST['lock_tables']),
             'save_dir' => isset($cfg['SaveDir']) ? $cfg['SaveDir'] : null,
             'is_encoding_supported' => Encoding::isSupported(),
             'options_output_save_dir' => $optionsOutputSaveDir,
@@ -665,8 +665,8 @@ class Export
     ) {
         $cfgRelation = $this->relation->getRelationsParam();
 
-        if (isset($_REQUEST['single_table'])) {
-            $GLOBALS['single_table'] = $_REQUEST['single_table'];
+        if (isset($_POST['single_table'])) {
+            $GLOBALS['single_table'] = $_POST['single_table'];
         }
 
         /* Scan for plugins */
@@ -738,8 +738,8 @@ class Export
      */
     public function handleTemplateActions(array $cfgRelation)
     {
-        if (isset($_REQUEST['templateId'])) {
-            $id = $GLOBALS['dbi']->escapeString($_REQUEST['templateId']);
+        if (isset($_POST['templateId'])) {
+            $id = $GLOBALS['dbi']->escapeString($_POST['templateId']);
         } else {
             $id = '';
         }
@@ -748,16 +748,16 @@ class Export
            . Util::backquote($cfgRelation['export_templates']);
         $user = $GLOBALS['dbi']->escapeString($GLOBALS['cfg']['Server']['user']);
 
-        switch ($_REQUEST['templateAction']) {
+        switch ($_POST['templateAction']) {
             case 'create':
                 $query = "INSERT INTO " . $templateTable . "("
                 . " `username`, `export_type`,"
                 . " `template_name`, `template_data`"
                 . ") VALUES ("
                 . "'" . $user . "', "
-                . "'" . $GLOBALS['dbi']->escapeString($_REQUEST['exportType'])
-                . "', '" . $GLOBALS['dbi']->escapeString($_REQUEST['templateName'])
-                . "', '" . $GLOBALS['dbi']->escapeString($_REQUEST['templateData'])
+                . "'" . $GLOBALS['dbi']->escapeString($_POST['exportType'])
+                . "', '" . $GLOBALS['dbi']->escapeString($_POST['templateName'])
+                . "', '" . $GLOBALS['dbi']->escapeString($_POST['templateData'])
                 . "');";
                 break;
             case 'load':
@@ -766,7 +766,7 @@ class Export
                 break;
             case 'update':
                 $query = "UPDATE " . $templateTable . " SET `template_data` = "
-                  . "'" . $GLOBALS['dbi']->escapeString($_REQUEST['templateData']) . "'"
+                  . "'" . $GLOBALS['dbi']->escapeString($_POST['templateData']) . "'"
                   . " WHERE `id` = " . $id . " AND `username` = '" . $user . "'";
                 break;
             case 'delete':
@@ -789,12 +789,12 @@ class Export
         }
 
         $response->setRequestStatus(true);
-        if ('create' == $_REQUEST['templateAction']) {
+        if ('create' == $_POST['templateAction']) {
             $response->addJSON(
                 'data',
-                $this->getOptionsForTemplates($_REQUEST['exportType'])
+                $this->getOptionsForTemplates($_POST['exportType'])
             );
-        } elseif ('load' == $_REQUEST['templateAction']) {
+        } elseif ('load' == $_POST['templateAction']) {
             $data = null;
             while ($row = $GLOBALS['dbi']->fetchAssoc(
                 $result,
diff --git a/libraries/classes/Display/Results.php b/libraries/classes/Display/Results.php
index 98a60c8ddf..5845b3f3a9 100644
--- a/libraries/classes/Display/Results.php
+++ b/libraries/classes/Display/Results.php
@@ -3032,29 +3032,30 @@ class Results
                     $include_file = 'libraries/classes/Plugins/Transformations/' . $file;
 
                     if (@file_exists($include_file)) {
-                        include_once $include_file;
                         $class_name = $this->transformations->getClassName($include_file);
-                        // todo add $plugin_manager
-                        $plugin_manager = null;
-                        $transformation_plugin = new $class_name(
-                            $plugin_manager
-                        );
+                        if (class_exists($class_name)) {
+                            // todo add $plugin_manager
+                            $plugin_manager = null;
+                            $transformation_plugin = new $class_name(
+                                $plugin_manager
+                            );
 
-                        $transform_options = $this->transformations->getOptions(
-                            isset(
-                                $mime_map[$orgFullColName]
+                            $transform_options = $this->transformations->getOptions(
+                                isset(
+                                    $mime_map[$orgFullColName]
+                                    ['transformation_options']
+                                )
+                                ? $mime_map[$orgFullColName]
                                 ['transformation_options']
-                            )
-                            ? $mime_map[$orgFullColName]
-                            ['transformation_options']
-                            : ''
-                        );
+                                : ''
+                            );
 
-                        $meta->mimetype = str_replace(
-                            '_',
-                            '/',
-                            $mime_map[$orgFullColName]['mimetype']
-                        );
+                            $meta->mimetype = str_replace(
+                                '_',
+                                '/',
+                                $mime_map[$orgFullColName]['mimetype']
+                            );
+                        }
                     } // end if file_exists
                 } // end if transformation is set
             } // end if mime/transformation works.
@@ -4168,13 +4169,13 @@ class Results
         }
 
         // as this is a form value, the type is always string so we cannot
-        // use Core::isValid($_REQUEST['session_max_rows'], 'integer')
-        if (Core::isValid($_REQUEST['session_max_rows'], 'numeric')) {
-            $query['max_rows'] = (int)$_REQUEST['session_max_rows'];
-            unset($_REQUEST['session_max_rows']);
-        } elseif ($_REQUEST['session_max_rows'] == self::ALL_ROWS) {
+        // use Core::isValid($_POST['session_max_rows'], 'integer')
+        if (Core::isValid($_POST['session_max_rows'], 'numeric')) {
+            $query['max_rows'] = (int)$_POST['session_max_rows'];
+            unset($_POST['session_max_rows']);
+        } elseif ($_POST['session_max_rows'] == self::ALL_ROWS) {
             $query['max_rows'] = self::ALL_ROWS;
-            unset($_REQUEST['session_max_rows']);
+            unset($_POST['session_max_rows']);
         } elseif (empty($query['max_rows'])) {
             $query['max_rows'] = intval($GLOBALS['cfg']['MaxRows']);
         }
diff --git a/libraries/classes/ErrorReport.php b/libraries/classes/ErrorReport.php
index 3dfd72270d..d8873fc1b2 100644
--- a/libraries/classes/ErrorReport.php
+++ b/libraries/classes/ErrorReport.php
@@ -103,10 +103,10 @@ class ErrorReport
         ];
 
         if ($exceptionType == 'js') {
-            if (empty($_REQUEST['exception'])) {
+            if (empty($_POST['exception'])) {
                 return [];
             }
-            $exception = $_REQUEST['exception'];
+            $exception = $_POST['exception'];
             $exception["stack"] = $this->translateStacktrace($exception["stack"]);
             list($uri, $scriptName) = $this->sanitizeUrl((string)$exception["url"]);
             $exception["uri"] = $uri;
@@ -115,10 +115,10 @@ class ErrorReport
             $report["exception_type"] = 'js';
             $report["exception"] = $exception;
             $report["script_name"] = $scriptName;
-            $report["microhistory"] = $_REQUEST['microhistory'];
+            $report["microhistory"] = $_POST['microhistory'];
 
-            if (! empty($_REQUEST['description'])) {
-                $report['steps'] = $_REQUEST['description'];
+            if (! empty($_POST['description'])) {
+                $report['steps'] = $_POST['description'];
             }
         } elseif ($exceptionType == 'php') {
             $errors = [];
diff --git a/libraries/classes/Export.php b/libraries/classes/Export.php
index 62c93361d4..95091107ab 100644
--- a/libraries/classes/Export.php
+++ b/libraries/classes/Export.php
@@ -342,9 +342,9 @@ class Export
             . preg_replace('@[/\\\\]@', '_', $filename);
 
         if (@file_exists($save_filename)
-            && ((! $quick_export && empty($_REQUEST['onserver_overwrite']))
+            && ((! $quick_export && empty($_POST['onserver_overwrite']))
             || ($quick_export
-            && $_REQUEST['quick_export_onserver_overwrite'] != 'saveitover'))
+            && $_POST['quick_export_onserver_overwrite'] != 'saveitover'))
         ) {
             $message = Message::error(
                 __(
@@ -474,45 +474,44 @@ class Export
         $html = '<div>';
 
         /**
-         * Displays a back button with all the $_REQUEST data in the URL
+         * Displays a back button with all the $_POST data in the URL
          * (store in a variable to also display after the textarea)
          */
         $back_button = '<p id="export_back_button">[ <a href="';
         if ($export_type == 'server') {
-            $back_button .= 'server_export.php' . Url::getCommon();
+            $back_button .= 'server_export.php" data-post="' . Url::getCommon([], '');
         } elseif ($export_type == 'database') {
-            $back_button .= 'db_export.php' . Url::getCommon(['db' => $db]);
+            $back_button .= 'db_export.php" data-post="' . Url::getCommon(['db' => $db], '');
         } else {
-            $back_button .= 'tbl_export.php' . Url::getCommon(
-                [
-                    'db' => $db, 'table' => $table
-                ]
+            $back_button .= 'tbl_export.php" data-post="' . Url::getCommon(
+                ['db' => $db, 'table' => $table],
+                ''
             );
         }
 
         // Convert the multiple select elements from an array to a string
-        if ($export_type == 'server' && isset($_REQUEST['db_select'])) {
-            $_REQUEST['db_select'] = implode(",", $_REQUEST['db_select']);
+        if ($export_type == 'server' && isset($_POST['db_select'])) {
+            $_POST['db_select'] = implode(",", $_POST['db_select']);
         } elseif ($export_type == 'database') {
-            if (isset($_REQUEST['table_select'])) {
-                $_REQUEST['table_select'] = implode(",", $_REQUEST['table_select']);
+            if (isset($_POST['table_select'])) {
+                $_POST['table_select'] = implode(",", $_POST['table_select']);
             }
-            if (isset($_REQUEST['table_structure'])) {
-                $_REQUEST['table_structure'] = implode(
+            if (isset($_POST['table_structure'])) {
+                $_POST['table_structure'] = implode(
                     ",",
-                    $_REQUEST['table_structure']
+                    $_POST['table_structure']
                 );
-            } elseif (empty($_REQUEST['structure_or_data_forced'])) {
-                $_REQUEST['table_structure'] = '';
+            } elseif (empty($_POST['structure_or_data_forced'])) {
+                $_POST['table_structure'] = '';
             }
-            if (isset($_REQUEST['table_data'])) {
-                $_REQUEST['table_data'] = implode(",", $_REQUEST['table_data']);
-            } elseif (empty($_REQUEST['structure_or_data_forced'])) {
-                $_REQUEST['table_data'] = '';
+            if (isset($_POST['table_data'])) {
+                $_POST['table_data'] = implode(",", $_POST['table_data']);
+            } elseif (empty($_POST['structure_or_data_forced'])) {
+                $_POST['table_data'] = '';
             }
         }
 
-        foreach ($_REQUEST as $name => $value) {
+        foreach ($_POST as $name => $value) {
             if (!is_array($value)) {
                 $back_button .= '&amp;' . urlencode((string) $name) . '=' . urlencode((string) $value);
             }
diff --git a/libraries/classes/Footer.php b/libraries/classes/Footer.php
index aba11c80a4..899c2a4a1b 100644
--- a/libraries/classes/Footer.php
+++ b/libraries/classes/Footer.php
@@ -154,28 +154,28 @@ class Footer
             'target' => $target
         ];
         // needed for server privileges tabs
-        if (isset($_REQUEST['viewing_mode'])
-            && in_array($_REQUEST['viewing_mode'], ['server', 'db', 'table'])
+        if (isset($_GET['viewing_mode'])
+            && in_array($_GET['viewing_mode'], ['server', 'db', 'table'])
         ) {
-            $params['viewing_mode'] = $_REQUEST['viewing_mode'];
+            $params['viewing_mode'] = $_GET['viewing_mode'];
         }
         /*
          * @todo    coming from server_privileges.php, here $db is not set,
          *          add the following condition below when that is fixed
-         *          && $_REQUEST['checkprivsdb'] == $db
+         *          && $_GET['checkprivsdb'] == $db
          */
-        if (isset($_REQUEST['checkprivsdb'])
+        if (isset($_GET['checkprivsdb'])
         ) {
-            $params['checkprivsdb'] = $_REQUEST['checkprivsdb'];
+            $params['checkprivsdb'] = $_GET['checkprivsdb'];
         }
         /*
          * @todo    coming from server_privileges.php, here $table is not set,
          *          add the following condition below when that is fixed
          *          && $_REQUEST['checkprivstable'] == $table
          */
-        if (isset($_REQUEST['checkprivstable'])
+        if (isset($_GET['checkprivstable'])
         ) {
-            $params['checkprivstable'] = $_REQUEST['checkprivstable'];
+            $params['checkprivstable'] = $_GET['checkprivstable'];
         }
         if (isset($_REQUEST['single_table'])
             && in_array($_REQUEST['single_table'], [true, false])
diff --git a/libraries/classes/Import.php b/libraries/classes/Import.php
index d26ef100c9..336a8d6c43 100644
--- a/libraries/classes/Import.php
+++ b/libraries/classes/Import.php
@@ -297,7 +297,7 @@ class Import
         $import_run_buffer = $this->runQueryPost($import_run_buffer, $sql, $full);
 
         // In case of ROLLBACK, notify the user.
-        if (isset($_REQUEST['rollback_query'])) {
+        if (isset($_POST['rollback_query'])) {
             $msg .= __('[ROLLBACK occurred.]');
         }
     }
@@ -1365,7 +1365,7 @@ class Import
         $response = Response::getInstance();
         $error = false;
         $error_msg = __('Only single-table UPDATE and DELETE queries can be simulated.');
-        $sql_delimiter = $_REQUEST['sql_delimiter'];
+        $sql_delimiter = $_POST['sql_delimiter'];
         $sql_data = [];
         $queries = explode($sql_delimiter, $GLOBALS['sql_query']);
         foreach ($queries as $sql_query) {
@@ -1587,7 +1587,7 @@ class Import
      */
     public function handleRollbackRequest(string $sql_query): void
     {
-        $sql_delimiter = $_REQUEST['sql_delimiter'];
+        $sql_delimiter = $_POST['sql_delimiter'];
         $queries = explode($sql_delimiter, $sql_query);
         $error = false;
         $error_msg = __(
@@ -1612,7 +1612,7 @@ class Import
         }
 
         if ($error) {
-            unset($_REQUEST['rollback_query']);
+            unset($_POST['rollback_query']);
             $response = Response::getInstance();
             $message = Message::rawError($error);
             $response->addJSON('message', $message);
diff --git a/libraries/classes/Index.php b/libraries/classes/Index.php
index 2d5765d51b..6df7ad7f3e 100644
--- a/libraries/classes/Index.php
+++ b/libraries/classes/Index.php
@@ -740,7 +740,7 @@ class Index
                 $r .= '" ' . $row_span . '>'
                    . '    <a class="';
                 $r .= 'ajax';
-                $r .= '" href="tbl_indexes.php' . Url::getCommon($this_params)
+                $r .= '" href="tbl_indexes.php" data-post="' . Url::getCommon($this_params, '')
                    . '">' . Util::getIcon('b_edit', __('Edit')) . '</a>'
                    . '</td>' . "\n";
                 $this_params = $GLOBALS['url_params'];
diff --git a/libraries/classes/InsertEdit.php b/libraries/classes/InsertEdit.php
index 53478c73fa..340d011c37 100644
--- a/libraries/classes/InsertEdit.php
+++ b/libraries/classes/InsertEdit.php
@@ -89,8 +89,8 @@ class InsertEdit
                 $_form_params['where_clause[' . $key_id . ']'] = trim($where_clause);
             }
         }
-        if (isset($_REQUEST['clause_is_unique'])) {
-            $_form_params['clause_is_unique'] = $_REQUEST['clause_is_unique'];
+        if (isset($_POST['clause_is_unique'])) {
+            $_form_params['clause_is_unique'] = $_POST['clause_is_unique'];
         }
         return $_form_params;
     }
@@ -290,13 +290,13 @@ class InsertEdit
         $this_url_params = array_merge($url_params, $params);
 
         if (! $is_show) {
-            return ' : <a href="tbl_change.php'
-                . Url::getCommon($this_url_params) . '">'
+            return ' : <a href="tbl_change.php" data-post="'
+                . Url::getCommon($this_url_params, '') . '">'
                 . $this->showTypeOrFunctionLabel($which)
                 . '</a>';
         }
-        return '<th><a href="tbl_change.php'
-            . Url::getCommon($this_url_params)
+        return '<th><a href="tbl_change.php" data-post="'
+            . Url::getCommon($this_url_params, '')
             . '" title="' . __('Hide') . '">'
             . $this->showTypeOrFunctionLabel($which)
             . '</a></th>';
@@ -860,7 +860,7 @@ class InsertEdit
             . 'id="field_' . $idindex . '_3" '
             . 'value="' . htmlspecialchars($data) . '" />';
 
-        $html_output .= '<a class="ajax browse_foreign" href="browse_foreigners.php'
+        $html_output .= '<a class="ajax browse_foreign" href="browse_foreigners.php" data-post="'
             . Url::getCommon(
                 [
                     'db' => $db,
@@ -868,7 +868,8 @@ class InsertEdit
                     'field' => $column['Field'],
                     'rownumber' => $rownumber,
                     'data'      => $data
-                ]
+                ],
+                ''
             ) . '">'
             . str_replace("'", "\'", $titles['Browse']) . '</a>';
         return $html_output;
@@ -1137,7 +1138,7 @@ class InsertEdit
             $html_output .= '<option value="' . $enum_value['html'] . '"';
             if ($data == $enum_value['plain']
                 || ($data == ''
-                && (! isset($_REQUEST['where_clause']) || $column['Null'] != 'YES')
+                && (! isset($_POST['where_clause']) || $column['Null'] != 'YES')
                 && isset($column['Default'])
                 && $enum_value['plain'] == $column['Default'])
             ) {
@@ -1193,7 +1194,7 @@ class InsertEdit
                 . ' ' . $onChangeClause;
             if ($data == $enum_value['plain']
                 || ($data == ''
-                && (! isset($_REQUEST['where_clause']) || $column['Null'] != 'YES')
+                && (! isset($_POST['where_clause']) || $column['Null'] != 'YES')
                 && isset($column['Default'])
                 && $enum_value['plain'] == $column['Default'])
             ) {
@@ -1755,7 +1756,7 @@ class InsertEdit
             'err_url' => $err_url,
             'goto' => $GLOBALS['goto'],
             'sql_query' => isset($_POST['sql_query']) ? $_POST['sql_query'] : null,
-            'has_where_clause' => isset($_REQUEST['where_clause']),
+            'has_where_clause' => isset($_POST['where_clause']),
             'insert_rows_default' => $GLOBALS['cfg']['InsertRows'],
         ]);
     }
@@ -2037,8 +2038,8 @@ class InsertEdit
 
         //when copying row, it is useful to empty auto-increment column
         // to prevent duplicate key error
-        if (isset($_REQUEST['default_action'])
-            && $_REQUEST['default_action'] === 'insert'
+        if (isset($_POST['default_action'])
+            && $_POST['default_action'] === 'insert'
         ) {
             if ($column['Key'] === 'PRI'
                 && mb_strpos($column['Extra'], 'auto_increment') !== false
@@ -2117,29 +2118,29 @@ class InsertEdit
      */
     public function getParamsForUpdateOrInsert()
     {
-        if (isset($_REQUEST['where_clause'])) {
+        if (isset($_POST['where_clause'])) {
             // we were editing something => use the WHERE clause
-            $loop_array = is_array($_REQUEST['where_clause'])
-                ? $_REQUEST['where_clause']
-                : [$_REQUEST['where_clause']];
+            $loop_array = is_array($_POST['where_clause'])
+                ? $_POST['where_clause']
+                : [$_POST['where_clause']];
             $using_key  = true;
-            $is_insert  = isset($_REQUEST['submit_type'])
-                          && ($_REQUEST['submit_type'] == 'insert'
-                          || $_REQUEST['submit_type'] == 'showinsert'
-                          || $_REQUEST['submit_type'] == 'insertignore');
+            $is_insert  = isset($_POST['submit_type'])
+                          && ($_POST['submit_type'] == 'insert'
+                          || $_POST['submit_type'] == 'showinsert'
+                          || $_POST['submit_type'] == 'insertignore');
         } else {
             // new row => use indexes
             $loop_array = [];
-            if (! empty($_REQUEST['fields'])) {
-                foreach ($_REQUEST['fields']['multi_edit'] as $key => $dummy) {
+            if (! empty($_POST['fields'])) {
+                foreach ($_POST['fields']['multi_edit'] as $key => $dummy) {
                     $loop_array[] = $key;
                 }
             }
             $using_key  = false;
             $is_insert  = true;
         }
-        $is_insertignore  = isset($_REQUEST['submit_type'])
-            && $_REQUEST['submit_type'] == 'insertignore';
+        $is_insertignore  = isset($_POST['submit_type'])
+            && $_POST['submit_type'] == 'insertignore';
         return [$loop_array, $using_key, $is_insert, $is_insertignore];
     }
 
@@ -2151,11 +2152,11 @@ class InsertEdit
      */
     public function isInsertRow()
     {
-        if (isset($_REQUEST['insert_rows'])
-            && is_numeric($_REQUEST['insert_rows'])
-            && $_REQUEST['insert_rows'] != $GLOBALS['cfg']['InsertRows']
+        if (isset($_POST['insert_rows'])
+            && is_numeric($_POST['insert_rows'])
+            && $_POST['insert_rows'] != $GLOBALS['cfg']['InsertRows']
         ) {
-            $GLOBALS['cfg']['InsertRows'] = $_REQUEST['insert_rows'];
+            $GLOBALS['cfg']['InsertRows'] = $_POST['insert_rows'];
             $response = Response::getInstance();
             $header = $response->getHeader();
             $scripts = $header->getScripts();
@@ -2215,8 +2216,8 @@ class InsertEdit
     public function getGotoInclude($goto_include)
     {
         $valid_options = ['new_insert', 'same_insert', 'edit_next'];
-        if (isset($_REQUEST['after_insert'])
-            && in_array($_REQUEST['after_insert'], $valid_options)
+        if (isset($_POST['after_insert'])
+            && in_array($_POST['after_insert'], $valid_options)
         ) {
             $goto_include = 'tbl_change.php';
         } elseif (! empty($GLOBALS['goto'])) {
@@ -2250,8 +2251,8 @@ class InsertEdit
      */
     public function getErrorUrl(array $url_params)
     {
-        if (isset($_REQUEST['err_url'])) {
-            return $_REQUEST['err_url'];
+        if (isset($_POST['err_url'])) {
+            return $_POST['err_url'];
         }
 
         return 'tbl_change.php' . Url::getCommon($url_params);
@@ -2260,7 +2261,7 @@ class InsertEdit
     /**
      * Builds the sql query
      *
-     * @param boolean $is_insertignore $_REQUEST['submit_type'] == 'insertignore'
+     * @param boolean $is_insertignore $_POST['submit_type'] == 'insertignore'
      * @param array   $query_fields    column names array
      * @param array   $value_sets      array of query values
      *
@@ -2310,7 +2311,7 @@ class InsertEdit
         $error_messages = [];
 
         foreach ($query as $single_query) {
-            if ($_REQUEST['submit_type'] == 'showinsert') {
+            if ($_POST['submit_type'] == 'showinsert') {
                 $last_messages[] = Message::notice(__('Showing SQL query'));
                 continue;
             }
@@ -2496,11 +2497,10 @@ class InsertEdit
     ) {
         $include_file = 'libraries/classes/Plugins/Transformations/' . $file;
         if (is_file($include_file)) {
-            include_once $include_file;
             $_url_params = [
                 'db'            => $db,
                 'table'         => $table,
-                'where_clause'  => $_REQUEST['where_clause'],
+                'where_clause'  => $_POST['where_clause'],
                 'transform_key' => $column_name
             ];
             $transform_options = $this->transformations->getOptions(
@@ -2510,19 +2510,21 @@ class InsertEdit
             );
             $transform_options['wrapper_link'] = Url::getCommon($_url_params);
             $class_name = $this->transformations->getClassName($include_file);
-            /** @var TransformationsPlugin $transformation_plugin */
-            $transformation_plugin = new $class_name();
+            if (class_exists($class_name)) {
+                /** @var TransformationsPlugin $transformation_plugin */
+                $transformation_plugin = new $class_name();
 
-            foreach ($edited_values as $cell_index => $curr_cell_edited_values) {
-                if (isset($curr_cell_edited_values[$column_name])) {
-                    $edited_values[$cell_index][$column_name]
-                        = $extra_data['transformations'][$cell_index]
-                            = $transformation_plugin->applyTransformation(
-                                $curr_cell_edited_values[$column_name],
-                                $transform_options
-                            );
-                }
-            }   // end of loop for each transformation cell
+                foreach ($edited_values as $cell_index => $curr_cell_edited_values) {
+                    if (isset($curr_cell_edited_values[$column_name])) {
+                        $edited_values[$cell_index][$column_name]
+                            = $extra_data['transformations'][$cell_index]
+                                = $transformation_plugin->applyTransformation(
+                                    $curr_cell_edited_values[$column_name],
+                                    $transform_options
+                                );
+                    }
+                }   // end of loop for each transformation cell
+            }
         }
         return $extra_data;
     }
@@ -2736,10 +2738,10 @@ class InsertEdit
                     $current_value = "''";
                 }
             } elseif ($type == 'set') {
-                if (! empty($_REQUEST['fields']['multi_edit'][$rownumber][$key])) {
+                if (! empty($_POST['fields']['multi_edit'][$rownumber][$key])) {
                     $current_value = implode(
                         ',',
-                        $_REQUEST['fields']['multi_edit'][$rownumber][$key]
+                        $_POST['fields']['multi_edit'][$rownumber][$key]
                     );
                     $current_value = "'"
                         . $this->dbi->escapeString($current_value) . "'";
@@ -2820,7 +2822,7 @@ class InsertEdit
             . Util::backquote($column_name)
             . ' FROM ' . Util::backquote($db) . '.'
             . Util::backquote($table)
-            . ' WHERE ' . $_REQUEST['where_clause'][0];
+            . ' WHERE ' . $_POST['where_clause'][0];
 
         $result = $this->dbi->tryQuery($sql_for_real_value);
         $fields_meta = $this->dbi->getFieldsMeta($result);
@@ -2866,23 +2868,23 @@ class InsertEdit
      */
     public function determineInsertOrEdit($where_clause, $db, $table)
     {
-        if (isset($_REQUEST['where_clause'])) {
-            $where_clause = $_REQUEST['where_clause'];
+        if (isset($_POST['where_clause'])) {
+            $where_clause = $_POST['where_clause'];
         }
         if (isset($_SESSION['edit_next'])) {
             $where_clause = $_SESSION['edit_next'];
             unset($_SESSION['edit_next']);
             $after_insert = 'edit_next';
         }
-        if (isset($_REQUEST['ShowFunctionFields'])) {
-            $GLOBALS['cfg']['ShowFunctionFields'] = $_REQUEST['ShowFunctionFields'];
+        if (isset($_POST['ShowFunctionFields'])) {
+            $GLOBALS['cfg']['ShowFunctionFields'] = $_POST['ShowFunctionFields'];
         }
-        if (isset($_REQUEST['ShowFieldTypesInDataEditView'])) {
+        if (isset($_POST['ShowFieldTypesInDataEditView'])) {
             $GLOBALS['cfg']['ShowFieldTypesInDataEditView']
-                = $_REQUEST['ShowFieldTypesInDataEditView'];
+                = $_POST['ShowFieldTypesInDataEditView'];
         }
-        if (isset($_REQUEST['after_insert'])) {
-            $after_insert = $_REQUEST['after_insert'];
+        if (isset($_POST['after_insert'])) {
+            $after_insert = $_POST['after_insert'];
         }
 
         if (isset($where_clause)) {
@@ -2907,8 +2909,8 @@ class InsertEdit
 
         // Copying a row - fetched data will be inserted as a new row,
         // therefore the where clause is needless.
-        if (isset($_REQUEST['default_action'])
-            && $_REQUEST['default_action'] === 'insert'
+        if (isset($_POST['default_action'])
+            && $_POST['default_action'] === 'insert'
         ) {
             $where_clause = $where_clauses = null;
         }
@@ -3285,42 +3287,43 @@ class InsertEdit
             $file = $column_mime['input_transformation'];
             $include_file = 'libraries/classes/Plugins/Transformations/' . $file;
             if (is_file($include_file)) {
-                include_once $include_file;
                 $class_name = $this->transformations->getClassName($include_file);
-                $transformation_plugin = new $class_name();
-                $transformation_options = $this->transformations->getOptions(
-                    $column_mime['input_transformation_options']
-                );
-                $_url_params = [
-                    'db'            => $db,
-                    'table'         => $table,
-                    'transform_key' => $column['Field'],
-                    'where_clause'  => $where_clause
-                ];
-                $transformation_options['wrapper_link']
-                    = Url::getCommon($_url_params);
-                $current_value = '';
-                if (isset($current_row[$column['Field']])) {
-                    $current_value = $current_row[$column['Field']];
-                }
-                if (method_exists($transformation_plugin, 'getInputHtml')) {
-                    $transformed_html = $transformation_plugin->getInputHtml(
-                        $column,
-                        $row_id,
-                        $column_name_appendix,
-                        $transformation_options,
-                        $current_value,
-                        $text_dir,
-                        $tabindex,
-                        $tabindex_for_value,
-                        $idindex
-                    );
-                }
-                if (method_exists($transformation_plugin, 'getScripts')) {
-                    $GLOBALS['plugin_scripts'] = array_merge(
-                        $GLOBALS['plugin_scripts'],
-                        $transformation_plugin->getScripts()
+                if (class_exists($class_name)) {
+                    $transformation_plugin = new $class_name();
+                    $transformation_options = $this->transformations->getOptions(
+                        $column_mime['input_transformation_options']
                     );
+                    $_url_params = [
+                        'db'            => $db,
+                        'table'         => $table,
+                        'transform_key' => $column['Field'],
+                        'where_clause'  => $where_clause
+                    ];
+                    $transformation_options['wrapper_link']
+                        = Url::getCommon($_url_params);
+                    $current_value = '';
+                    if (isset($current_row[$column['Field']])) {
+                        $current_value = $current_row[$column['Field']];
+                    }
+                    if (method_exists($transformation_plugin, 'getInputHtml')) {
+                        $transformed_html = $transformation_plugin->getInputHtml(
+                            $column,
+                            $row_id,
+                            $column_name_appendix,
+                            $transformation_options,
+                            $current_value,
+                            $text_dir,
+                            $tabindex,
+                            $tabindex_for_value,
+                            $idindex
+                        );
+                    }
+                    if (method_exists($transformation_plugin, 'getScripts')) {
+                        $GLOBALS['plugin_scripts'] = array_merge(
+                            $GLOBALS['plugin_scripts'],
+                            $transformation_plugin->getScripts()
+                        );
+                    }
                 }
             }
         }
diff --git a/libraries/classes/Navigation/Navigation.php b/libraries/classes/Navigation/Navigation.php
index b355ddf922..fa5b8d74a3 100644
--- a/libraries/classes/Navigation/Navigation.php
+++ b/libraries/classes/Navigation/Navigation.php
@@ -53,8 +53,8 @@ class Navigation
         }
         $tree = new NavigationTree();
         if (! $response->isAjax()
-            || ! empty($_REQUEST['full'])
-            || ! empty($_REQUEST['reload'])
+            || ! empty($_POST['full'])
+            || ! empty($_POST['reload'])
         ) {
             if ($GLOBALS['cfg']['ShowDatabasesNavigationAsTree']) {
                 // provide database tree in navigation
@@ -240,8 +240,8 @@ class Navigation
 
                         $html .= '<tr>';
                         $html .= '<td>' . htmlspecialchars($hiddenItem) . '</td>';
-                        $html .= '<td style="width:80px"><a href="navigation.php'
-                            . Url::getCommon($params) . '"'
+                        $html .= '<td style="width:80px"><a href="navigation.php" data-post="'
+                            . Url::getCommon($params, '') . '"'
                             . ' class="unhideNavItem ajax">'
                             . Util::getIcon('show', __('Unhide'))
                             . '</a></td>';
diff --git a/libraries/classes/Navigation/NavigationTree.php b/libraries/classes/Navigation/NavigationTree.php
index b51efef844..6599aa0b71 100644
--- a/libraries/classes/Navigation/NavigationTree.php
+++ b/libraries/classes/Navigation/NavigationTree.php
@@ -95,8 +95,10 @@ class NavigationTree
     public function __construct()
     {
         // Save the position at which we are in the database list
-        if (isset($_REQUEST['pos'])) {
-            $this->_pos = (int)$_REQUEST['pos'];
+        if (isset($_POST['pos'])) {
+            $this->_pos = (int) $_POST['pos'];
+        } elseif (isset($_GET['pos'])) {
+            $this->_pos = (int) $_GET['pos'];
         }
         if (!isset($this->_pos)) {
             $this->_pos = $this->_getNavigationDbPos();
@@ -111,19 +113,19 @@ class NavigationTree
                 $this->_pos3_value[0] = $_REQUEST['pos3_value'];
             }
         } else {
-            if (isset($_REQUEST['n0_aPath'])) {
+            if (isset($_POST['n0_aPath'])) {
                 $count = 0;
-                while (isset($_REQUEST['n' . $count . '_aPath'])) {
+                while (isset($_POST['n' . $count . '_aPath'])) {
                     $this->_aPath[$count] = $this->_parsePath(
-                        $_REQUEST['n' . $count . '_aPath']
+                        $_POST['n' . $count . '_aPath']
                     );
                     $index = 'n' . $count . '_pos2_';
-                    $this->_pos2_name[$count] = $_REQUEST[$index . 'name'];
-                    $this->_pos2_value[$count] = $_REQUEST[$index . 'value'];
+                    $this->_pos2_name[$count] = $_POST[$index . 'name'];
+                    $this->_pos2_value[$count] = $_POST[$index . 'value'];
                     $index = 'n' . $count . '_pos3_';
-                    if (isset($_REQUEST[$index])) {
-                        $this->_pos3_name[$count] = $_REQUEST[$index . 'name'];
-                        $this->_pos3_value[$count] = $_REQUEST[$index . 'value'];
+                    if (isset($_POST[$index])) {
+                        $this->_pos3_name[$count] = $_POST[$index . 'name'];
+                        $this->_pos3_value[$count] = $_POST[$index . 'value'];
                     }
                     $count++;
                 }
@@ -132,11 +134,11 @@ class NavigationTree
         if (isset($_REQUEST['vPath'])) {
             $this->_vPath[0] = $this->_parsePath($_REQUEST['vPath']);
         } else {
-            if (isset($_REQUEST['n0_vPath'])) {
+            if (isset($_POST['n0_vPath'])) {
                 $count = 0;
-                while (isset($_REQUEST['n' . $count . '_vPath'])) {
+                while (isset($_POST['n' . $count . '_vPath'])) {
                     $this->_vPath[$count] = $this->_parsePath(
-                        $_REQUEST['n' . $count . '_vPath']
+                        $_POST['n' . $count . '_vPath']
                     );
                     $count++;
                 }
@@ -763,7 +765,7 @@ class NavigationTree
                 }
 
                 $groups[$key] = new Node(
-                    $key,
+                    htmlspecialchars($key),
                     Node::CONTAINER,
                     true
                 );
diff --git a/libraries/classes/Navigation/Nodes/NodeDatabase.php b/libraries/classes/Navigation/Nodes/NodeDatabase.php
index 7b39259a14..3fcb175354 100644
--- a/libraries/classes/Navigation/Nodes/NodeDatabase.php
+++ b/libraries/classes/Navigation/Nodes/NodeDatabase.php
@@ -679,8 +679,8 @@ class NodeDatabase extends Node
                     'dbName' => $this->real_name,
                 ];
                 $ret = '<span class="dbItemControls">'
-                    . '<a href="navigation.php'
-                    . Url::getCommon($params) . '"'
+                    . '<a href="navigation.php" data-post="'
+                    . Url::getCommon($params, '') . '"'
                     . ' class="showUnhide ajax">'
                     . Util::getImage(
                         'show',
diff --git a/libraries/classes/Navigation/Nodes/NodeDatabaseChild.php b/libraries/classes/Navigation/Nodes/NodeDatabaseChild.php
index fc0d4aea26..4c882f62e4 100644
--- a/libraries/classes/Navigation/Nodes/NodeDatabaseChild.php
+++ b/libraries/classes/Navigation/Nodes/NodeDatabaseChild.php
@@ -50,8 +50,8 @@ abstract class NodeDatabaseChild extends Node
             ];
 
             $ret = '<span class="navItemControls">'
-                . '<a href="navigation.php'
-                . Url::getCommon($params) . '"'
+                . '<a href="navigation.php" data-post="'
+                . Url::getCommon($params, '') . '"'
                 . ' class="hideNavItem ajax">'
                 . Util::getImage('hide', __('Hide'))
                 . '</a></span>';
diff --git a/libraries/classes/Normalization.php b/libraries/classes/Normalization.php
index a0823cf4ef..9f628109e6 100644
--- a/libraries/classes/Normalization.php
+++ b/libraries/classes/Normalization.php
@@ -159,7 +159,7 @@ class Normalization
             'fields_meta' => null,
             'mimework' => $cfgRelation['mimework'],
             'content_cells' => $contentCells,
-            'change_column' => $_REQUEST['change_column'],
+            'change_column' => $_POST['change_column'],
             'is_virtual_columns_supported' => Util::isVirtualColumnsSupported(),
             'browse_mime' => $GLOBALS['cfg']['BrowseMIME'],
             'server_type' => Util::getServerType(),
diff --git a/libraries/classes/Operations.php b/libraries/classes/Operations.php
index 6229a50815..22108bf3a4 100644
--- a/libraries/classes/Operations.php
+++ b/libraries/classes/Operations.php
@@ -76,20 +76,21 @@ class Operations
     /**
      * Get HTML output for rename database
      *
-     * @param string $db database name
+     * @param string $db           database name
+     * @param string $db_collation dataset collation
      *
      * @return string
      */
-    public function getHtmlForRenameDatabase($db)
+    public function getHtmlForRenameDatabase($db, $db_collation)
     {
         $html_output = '<div>'
             . '<form id="rename_db_form" '
             . 'class="ajax" '
             . 'method="post" action="db_operations.php" '
             . 'onsubmit="return emptyCheckTheField(this, \'newname\')">';
-        if (isset($_REQUEST['db_collation'])) {
+        if (!is_null($db_collation)) {
             $html_output .= '<input type="hidden" name="db_collation" '
-                . 'value="' . $_REQUEST['db_collation']
+                . 'value="' . $db_collation
                 . '" />' . "\n";
         }
         $html_output .= '<input type="hidden" name="what" value="data" />'
@@ -185,11 +186,12 @@ class Operations
     /**
      * Get HTML snippet for copy database
      *
-     * @param string $db database name
+     * @param string $db           database name
+     * @param string $db_collation dataset collation
      *
      * @return string
      */
-    public function getHtmlForCopyDatabase($db)
+    public function getHtmlForCopyDatabase($db, $db_collation)
     {
         $drop_clause = 'DROP TABLE / DROP VIEW';
         $choices = [
@@ -206,9 +208,9 @@ class Operations
             . 'method="post" action="db_operations.php" '
             . 'onsubmit="return emptyCheckTheField(this, \'newname\')">';
 
-        if (isset($_REQUEST['db_collation'])) {
+        if (!is_null($db_collation)) {
             $html_output .= '<input type="hidden" name="db_collation" '
-            . 'value="' . $_REQUEST['db_collation'] . '" />' . "\n";
+            . 'value="' . $db_collation . '" />' . "\n";
         }
         $html_output .= '<input type="hidden" name="db_copy" value="true" />' . "\n"
             . Url::getHiddenInputs($db);
@@ -285,19 +287,19 @@ class Operations
     /**
      * Get HTML snippet for change database charset
      *
-     * @param string $db    database name
-     * @param string $table table name
+     * @param string $db           database name
+     * @param string $db_collation dataset collation
      *
      * @return string
      */
-    public function getHtmlForChangeDatabaseCharset($db, $table)
+    public function getHtmlForChangeDatabaseCharset($db, $db_collation)
     {
         $html_output = '<div>'
             . '<form id="change_db_charset_form" ';
         $html_output .= 'class="ajax" ';
         $html_output .= 'method="post" action="db_operations.php">';
 
-        $html_output .= Url::getHiddenInputs($db, $table);
+        $html_output .= Url::getHiddenInputs($db);
 
         $html_output .= '<fieldset>' . "\n"
            . '    <legend>';
@@ -312,7 +314,7 @@ class Operations
                 $GLOBALS['cfg']['Server']['DisableIS'],
                 'db_collation',
                 'select_db_collation',
-                isset($_REQUEST['db_collation']) ? $_REQUEST['db_collation'] : '',
+                !is_null($db_collation) ? $db_collation : '',
                 false
             )
             . '<br />'
@@ -362,7 +364,7 @@ class Operations
                 if ($tmp_query !== null) {
                     // collect for later display
                     $GLOBALS['sql_query'] .= "\n" . $tmp_query;
-                    $this->dbi->selectDb($_REQUEST['newname']);
+                    $this->dbi->selectDb($_POST['newname']);
                     $this->dbi->query($tmp_query);
                 }
             }
@@ -380,7 +382,7 @@ class Operations
                 if ($tmp_query !== null) {
                     // collect for later display
                     $GLOBALS['sql_query'] .= "\n" . $tmp_query;
-                    $this->dbi->selectDb($_REQUEST['newname']);
+                    $this->dbi->selectDb($_POST['newname']);
                     $this->dbi->query($tmp_query);
                 }
             }
@@ -395,10 +397,10 @@ class Operations
     public function createDbBeforeCopy()
     {
         $local_query = 'CREATE DATABASE IF NOT EXISTS '
-            . Util::backquote($_REQUEST['newname']);
-        if (isset($_REQUEST['db_collation'])) {
+            . Util::backquote($_POST['newname']);
+        if (isset($_POST['db_collation'])) {
             $local_query .= ' DEFAULT'
-                . Util::getCharsetQueryPart($_REQUEST['db_collation']);
+                . Util::getCharsetQueryPart($_POST['db_collation']);
         }
         $local_query .= ';';
         $GLOBALS['sql_query'] .= $local_query;
@@ -441,12 +443,12 @@ class Operations
             // the real views are created after the tables
             if ($this->dbi->getTable($db, (string)$each_table)->isView()) {
                 // If view exists, and 'add drop view' is selected: Drop it!
-                if ($_REQUEST['what'] != 'nocopy'
-                    && isset($_REQUEST['drop_if_exists'])
-                    && $_REQUEST['drop_if_exists'] == 'true'
+                if ($_POST['what'] != 'nocopy'
+                    && isset($_POST['drop_if_exists'])
+                    && $_POST['drop_if_exists'] == 'true'
                 ) {
                     $drop_query = 'DROP VIEW IF EXISTS '
-                        . Util::backquote($_REQUEST['newname']) . '.'
+                        . Util::backquote($_POST['newname']) . '.'
                         . Util::backquote($each_table);
                     $this->dbi->query($drop_query);
 
@@ -460,7 +462,7 @@ class Operations
                     $each_table,
                     "\n"
                 );
-                $this->dbi->selectDb($_REQUEST['newname']);
+                $this->dbi->selectDb($_POST['newname']);
                 $this->dbi->query($sql_view_standin);
                 $GLOBALS['sql_query'] .= "\n" . $sql_view_standin;
             }
@@ -487,7 +489,7 @@ class Operations
             }
 
             // value of $what for this table only
-            $this_what = $_REQUEST['what'];
+            $this_what = $_POST['what'];
 
             // do not copy the data from a Merge table
             // note: on the calling FORM, 'data' means 'structure and data'
@@ -509,7 +511,7 @@ class Operations
                 if (! Table::moveCopy(
                     $db,
                     $each_table,
-                    $_REQUEST['newname'],
+                    $_POST['newname'],
                     $each_table,
                     (isset($this_what) ? $this_what : 'data'),
                     $move,
@@ -520,7 +522,7 @@ class Operations
                 }
                 // apply the triggers to the destination db+table
                 if ($triggers) {
-                    $this->dbi->selectDb($_REQUEST['newname']);
+                    $this->dbi->selectDb($_POST['newname']);
                     foreach ($triggers as $trigger) {
                         $this->dbi->query($trigger['create']);
                         $GLOBALS['sql_query'] .= "\n" . $trigger['create'] . ';';
@@ -528,7 +530,7 @@ class Operations
                 }
 
                 // this does not apply to a rename operation
-                if (isset($_REQUEST['add_constraints'])
+                if (isset($_POST['add_constraints'])
                     && ! empty($GLOBALS['sql_constraints_query'])
                 ) {
                     $sqlContraints[] = $GLOBALS['sql_constraints_query'];
@@ -562,7 +564,7 @@ class Operations
                 $tmp_query = $this->dbi->getDefinition($db, 'EVENT', $event_name);
                 // collect for later display
                 $GLOBALS['sql_query'] .= "\n" . $tmp_query;
-                $this->dbi->selectDb($_REQUEST['newname']);
+                $this->dbi->selectDb($_POST['newname']);
                 $this->dbi->query($tmp_query);
             }
         }
@@ -581,17 +583,17 @@ class Operations
     {
         // temporarily force to add DROP IF EXIST to CREATE VIEW query,
         // to remove stand-in VIEW that was created earlier
-        // ( $_REQUEST['drop_if_exists'] is used in moveCopy() )
-        if (isset($_REQUEST['drop_if_exists'])) {
-            $temp_drop_if_exists = $_REQUEST['drop_if_exists'];
+        // ( $_POST['drop_if_exists'] is used in moveCopy() )
+        if (isset($_POST['drop_if_exists'])) {
+            $temp_drop_if_exists = $_POST['drop_if_exists'];
         }
 
-        $_REQUEST['drop_if_exists'] = 'true';
+        $_POST['drop_if_exists'] = 'true';
         foreach ($views as $view) {
             $copying_succeeded = Table::moveCopy(
                 $db,
                 $view,
-                $_REQUEST['newname'],
+                $_POST['newname'],
                 $view,
                 'structure',
                 $move,
@@ -602,11 +604,11 @@ class Operations
                 break;
             }
         }
-        unset($_REQUEST['drop_if_exists']);
+        unset($_POST['drop_if_exists']);
 
         if (isset($temp_drop_if_exists)) {
             // restore previous value
-            $_REQUEST['drop_if_exists'] = $temp_drop_if_exists;
+            $_POST['drop_if_exists'] = $temp_drop_if_exists;
         }
     }
 
@@ -774,7 +776,7 @@ class Operations
      */
     public function createAllAccumulatedConstraints(array $sqlConstratints)
     {
-        $this->dbi->selectDb($_REQUEST['newname']);
+        $this->dbi->selectDb($_POST['newname']);
         foreach ($sqlConstratints as $one_query) {
             $this->dbi->query($one_query);
             // and prepare to display them
@@ -792,10 +794,10 @@ class Operations
      */
     public function duplicateBookmarks($_error, $db)
     {
-        if (! $_error && $db != $_REQUEST['newname']) {
+        if (! $_error && $db != $_POST['newname']) {
             $get_fields = ['user', 'label', 'query'];
             $where_fields = ['dbase' => $db];
-            $new_fields = ['dbase' => $_REQUEST['newname']];
+            $new_fields = ['dbase' => $_POST['newname']];
             Table::duplicateInfo(
                 'bookmarkwork',
                 'bookmark',
@@ -1793,9 +1795,9 @@ class Operations
         $sql_query = 'ALTER TABLE '
             . Util::backquote($GLOBALS['table'])
             . ' ORDER BY '
-            . Util::backquote(urldecode($_REQUEST['order_field']));
-        if (isset($_REQUEST['order_order'])
-            && $_REQUEST['order_order'] === 'desc'
+            . Util::backquote(urldecode($_POST['order_field']));
+        if (isset($_POST['order_order'])
+            && $_POST['order_order'] === 'desc'
         ) {
             $sql_query .= ' DESC';
         } else {
@@ -1837,11 +1839,11 @@ class Operations
 
         $table_alters = [];
 
-        if (isset($_REQUEST['comment'])
-            && urldecode($_REQUEST['prev_comment']) !== $_REQUEST['comment']
+        if (isset($_POST['comment'])
+            && urldecode($_POST['prev_comment']) !== $_POST['comment']
         ) {
             $table_alters[] = 'COMMENT = \''
-                . $this->dbi->escapeString($_REQUEST['comment']) . '\'';
+                . $this->dbi->escapeString($_POST['comment']) . '\'';
         }
 
         if (! empty($newTblStorageEngine)
@@ -1849,62 +1851,62 @@ class Operations
         ) {
             $table_alters[] = 'ENGINE = ' . $newTblStorageEngine;
         }
-        if (! empty($_REQUEST['tbl_collation'])
-            && $_REQUEST['tbl_collation'] !== $tbl_collation
+        if (! empty($_POST['tbl_collation'])
+            && $_POST['tbl_collation'] !== $tbl_collation
         ) {
             $table_alters[] = 'DEFAULT '
-                . Util::getCharsetQueryPart($_REQUEST['tbl_collation']);
+                . Util::getCharsetQueryPart($_POST['tbl_collation']);
         }
 
         if ($pma_table->isEngine(['MYISAM', 'ARIA', 'ISAM'])
-            && isset($_REQUEST['new_pack_keys'])
-            && $_REQUEST['new_pack_keys'] != (string)$pack_keys
+            && isset($_POST['new_pack_keys'])
+            && $_POST['new_pack_keys'] != (string)$pack_keys
         ) {
-            $table_alters[] = 'pack_keys = ' . $_REQUEST['new_pack_keys'];
+            $table_alters[] = 'pack_keys = ' . $_POST['new_pack_keys'];
         }
 
-        $_REQUEST['new_checksum'] = empty($_REQUEST['new_checksum']) ? '0' : '1';
+        $_POST['new_checksum'] = empty($_POST['new_checksum']) ? '0' : '1';
         if ($pma_table->isEngine(['MYISAM', 'ARIA'])
-            && $_REQUEST['new_checksum'] !== $checksum
+            && $_POST['new_checksum'] !== $checksum
         ) {
-            $table_alters[] = 'checksum = ' . $_REQUEST['new_checksum'];
+            $table_alters[] = 'checksum = ' . $_POST['new_checksum'];
         }
 
-        $_REQUEST['new_transactional']
-            = empty($_REQUEST['new_transactional']) ? '0' : '1';
+        $_POST['new_transactional']
+            = empty($_POST['new_transactional']) ? '0' : '1';
         if ($pma_table->isEngine('ARIA')
-            && $_REQUEST['new_transactional'] !== $transactional
+            && $_POST['new_transactional'] !== $transactional
         ) {
-            $table_alters[] = 'TRANSACTIONAL = ' . $_REQUEST['new_transactional'];
+            $table_alters[] = 'TRANSACTIONAL = ' . $_POST['new_transactional'];
         }
 
-        $_REQUEST['new_page_checksum']
-            = empty($_REQUEST['new_page_checksum']) ? '0' : '1';
+        $_POST['new_page_checksum']
+            = empty($_POST['new_page_checksum']) ? '0' : '1';
         if ($pma_table->isEngine('ARIA')
-            && $_REQUEST['new_page_checksum'] !== $page_checksum
+            && $_POST['new_page_checksum'] !== $page_checksum
         ) {
-            $table_alters[] = 'PAGE_CHECKSUM = ' . $_REQUEST['new_page_checksum'];
+            $table_alters[] = 'PAGE_CHECKSUM = ' . $_POST['new_page_checksum'];
         }
 
-        $_REQUEST['new_delay_key_write']
-            = empty($_REQUEST['new_delay_key_write']) ? '0' : '1';
+        $_POST['new_delay_key_write']
+            = empty($_POST['new_delay_key_write']) ? '0' : '1';
         if ($pma_table->isEngine(['MYISAM', 'ARIA'])
-            && $_REQUEST['new_delay_key_write'] !== $delay_key_write
+            && $_POST['new_delay_key_write'] !== $delay_key_write
         ) {
-            $table_alters[] = 'delay_key_write = ' . $_REQUEST['new_delay_key_write'];
+            $table_alters[] = 'delay_key_write = ' . $_POST['new_delay_key_write'];
         }
 
         if ($pma_table->isEngine(['MYISAM', 'ARIA', 'INNODB', 'PBXT'])
-            && ! empty($_REQUEST['new_auto_increment'])
+            && ! empty($_POST['new_auto_increment'])
             && (! isset($auto_increment)
-            || $_REQUEST['new_auto_increment'] !== $auto_increment)
+            || $_POST['new_auto_increment'] !== $auto_increment)
         ) {
             $table_alters[] = 'auto_increment = '
-                . $this->dbi->escapeString($_REQUEST['new_auto_increment']);
+                . $this->dbi->escapeString($_POST['new_auto_increment']);
         }
 
-        if (! empty($_REQUEST['new_row_format'])) {
-            $newRowFormat = $_REQUEST['new_row_format'];
+        if (! empty($_POST['new_row_format'])) {
+            $newRowFormat = $_POST['new_row_format'];
             $newRowFormatLower = mb_strtolower($newRowFormat);
             if ($pma_table->isEngine(['MYISAM', 'ARIA', 'INNODB', 'PBXT'])
                 && (strlen($row_format) === 0
@@ -1933,8 +1935,8 @@ class Operations
             // should not be reported with a Level of Error, so here
             // I just ignore it. But there are other 1478 messages
             // that it's better to show.
-            if (! (isset($_REQUEST['new_tbl_storage_engine'])
-                && $_REQUEST['new_tbl_storage_engine'] == 'MyISAM'
+            if (! (isset($_POST['new_tbl_storage_engine'])
+                && $_POST['new_tbl_storage_engine'] == 'MyISAM'
                 && $warning['Code'] == '1478'
                 && $warning['Level'] == 'Error')
             ) {
@@ -1955,13 +1957,13 @@ class Operations
     {
         $sql_query = 'ALTER TABLE '
             . Util::backquote($GLOBALS['table']) . ' '
-            . $_REQUEST['partition_operation']
+            . $_POST['partition_operation']
             . ' PARTITION ';
 
-        if ($_REQUEST['partition_operation'] == 'COALESCE') {
-            $sql_query .= count($_REQUEST['partition_name']);
+        if ($_POST['partition_operation'] == 'COALESCE') {
+            $sql_query .= count($_POST['partition_name']);
         } else {
-            $sql_query .= implode(', ', $_REQUEST['partition_name']) . ';';
+            $sql_query .= implode(', ', $_POST['partition_name']) . ';';
         }
 
         $result = $this->dbi->query($sql_query);
@@ -2110,19 +2112,19 @@ class Operations
         $this->dbi->selectDb($db);
 
         /**
-         * $_REQUEST['target_db'] could be empty in case we came from an input field
+         * $_POST['target_db'] could be empty in case we came from an input field
          * (when there are many databases, no drop-down)
          */
-        if (empty($_REQUEST['target_db'])) {
-            $_REQUEST['target_db'] = $db;
+        if (empty($_POST['target_db'])) {
+            $_POST['target_db'] = $db;
         }
 
         /**
          * A target table name has been sent to this script -> do the work
          */
-        if (Core::isValid($_REQUEST['new_name'])) {
-            if ($db == $_REQUEST['target_db'] && $table == $_REQUEST['new_name']) {
-                if (isset($_REQUEST['submit_move'])) {
+        if (Core::isValid($_POST['new_name'])) {
+            if ($db == $_POST['target_db'] && $table == $_POST['new_name']) {
+                if (isset($_POST['submit_move'])) {
                     $message = Message::error(__('Can\'t move table to same one!'));
                 } else {
                     $message = Message::error(__('Can\'t copy table to same one!'));
@@ -2131,33 +2133,33 @@ class Operations
                 Table::moveCopy(
                     $db,
                     $table,
-                    $_REQUEST['target_db'],
-                    $_REQUEST['new_name'],
-                    $_REQUEST['what'],
-                    isset($_REQUEST['submit_move']),
+                    $_POST['target_db'],
+                    $_POST['new_name'],
+                    $_POST['what'],
+                    isset($_POST['submit_move']),
                     'one_table'
                 );
 
-                if (isset($_REQUEST['adjust_privileges'])
-                    && ! empty($_REQUEST['adjust_privileges'])
+                if (isset($_POST['adjust_privileges'])
+                    && ! empty($_POST['adjust_privileges'])
                 ) {
-                    if (isset($_REQUEST['submit_move'])) {
+                    if (isset($_POST['submit_move'])) {
                         $this->adjustPrivilegesRenameOrMoveTable(
                             $db,
                             $table,
-                            $_REQUEST['target_db'],
-                            $_REQUEST['new_name']
+                            $_POST['target_db'],
+                            $_POST['new_name']
                         );
                     } else {
                         $this->adjustPrivilegesCopyTable(
                             $db,
                             $table,
-                            $_REQUEST['target_db'],
-                            $_REQUEST['new_name']
+                            $_POST['target_db'],
+                            $_POST['new_name']
                         );
                     }
 
-                    if (isset($_REQUEST['submit_move'])) {
+                    if (isset($_POST['submit_move'])) {
                         $message = Message::success(
                             __(
                                 'Table %s has been moved to %s. Privileges have been '
@@ -2173,7 +2175,7 @@ class Operations
                         );
                     }
                 } else {
-                    if (isset($_REQUEST['submit_move'])) {
+                    if (isset($_POST['submit_move'])) {
                         $message = Message::success(
                             __('Table %s has been moved to %s.')
                         );
@@ -2188,20 +2190,20 @@ class Operations
                     . Util::backquote($table);
                 $message->addParam($old);
 
-                $new_name = $_REQUEST['new_name'];
+                $new_name = $_POST['new_name'];
                 if ($this->dbi->getLowerCaseNames() === '1') {
                     $new_name = strtolower($new_name);
                 }
 
                 $GLOBALS['table'] = $new_name;
 
-                $new = Util::backquote($_REQUEST['target_db']) . '.'
+                $new = Util::backquote($_POST['target_db']) . '.'
                     . Util::backquote($new_name);
                 $message->addParam($new);
 
                 /* Check: Work on new table or on old table? */
-                if (isset($_REQUEST['submit_move'])
-                    || Core::isValid($_REQUEST['switch_to_new'])
+                if (isset($_POST['submit_move'])
+                    || Core::isValid($_POST['switch_to_new'])
                 ) {
                 }
             }
diff --git a/libraries/classes/Relation.php b/libraries/classes/Relation.php
index 145bf34474..9c59fa7f1a 100644
--- a/libraries/classes/Relation.php
+++ b/libraries/classes/Relation.php
@@ -2095,7 +2095,7 @@ class Relation
     {
         $retval = '';
 
-        $url_query = Url::getCommon(['db' => $GLOBALS['db']]);
+        $url_query = Url::getCommon(['db' => $GLOBALS['db']], '');
         if ($allTables) {
             if ($createDb) {
                 $url_query .= '&amp;goto=db_operations.php&amp;create_pmadb=1';
@@ -2120,7 +2120,7 @@ class Relation
                 __('%sCreate%s missing phpMyAdmin configuration storage tables.')
             );
         }
-        $message->addParamHtml('<a href="./chk_rel.php' . $url_query . '">');
+        $message->addParamHtml('<a href="./chk_rel.php" data-post="' . $url_query . '">');
         $message->addParamHtml('</a>');
 
         $retval .= $message->getDisplay();
diff --git a/libraries/classes/ReplicationGui.php b/libraries/classes/ReplicationGui.php
index 5673e89030..81ac565a1a 100644
--- a/libraries/classes/ReplicationGui.php
+++ b/libraries/classes/ReplicationGui.php
@@ -68,7 +68,7 @@ class ReplicationGui
     public function getHtmlForMasterReplication()
     {
         $html = '';
-        if (! isset($_REQUEST['repl_clear_scr'])) {
+        if (! isset($_POST['repl_clear_scr'])) {
             $html .= '<fieldset>';
             $html .= '<legend>' . __('Master replication') . '</legend>';
             $html .= __('This server is configured as master in a replication process.');
@@ -87,16 +87,16 @@ class ReplicationGui
             $_url_params['mr_adduser'] = true;
             $_url_params['repl_clear_scr'] = true;
 
-            $html .= '  <li><a href="server_replication.php';
-            $html .= Url::getCommon($_url_params)
+            $html .= '  <li><a href="server_replication.php" data-post="';
+            $html .= Url::getCommon($_url_params, '')
                 . '" id="master_addslaveuser_href">';
             $html .= __('Add slave replication user') . '</a></li>';
         }
 
         // Display 'Add replication slave user' form
-        if (isset($_REQUEST['mr_adduser'])) {
+        if (isset($_POST['mr_adduser'])) {
             $html .= $this->getHtmlForReplicationMasterAddSlaveUser();
-        } elseif (! isset($_REQUEST['repl_clear_scr'])) {
+        } elseif (! isset($_POST['repl_clear_scr'])) {
             $html .= "</ul>";
             $html .= "</fieldset>";
         }
@@ -180,8 +180,8 @@ class ReplicationGui
             $html .= ' <select name="master_connection">';
             $html .= '<option value="">' . __('Default') . '</option>';
             foreach ($server_slave_multi_replication as $server) {
-                $html .= '<option' . (isset($_REQUEST['master_connection'])
-                    && $_REQUEST['master_connection'] == $server['Connection_name'] ?
+                $html .= '<option' . (isset($_POST['master_connection'])
+                    && $_POST['master_connection'] == $server['Connection_name'] ?
                         ' selected="selected"' : '') . '>' . $server['Connection_name']
                     . '</option>';
             }
@@ -204,8 +204,7 @@ class ReplicationGui
             }
 
             $_url_params['sr_slave_control_parm'] = 'IO_THREAD';
-            $slave_control_io_link = 'server_replication.php'
-                . Url::getCommon($_url_params);
+            $slave_control_io_link = Url::getCommon($_url_params, '');
 
             if ($server_slave_replication[0]['Slave_SQL_Running'] == 'No') {
                 $_url_params['sr_slave_action'] = 'start';
@@ -214,8 +213,7 @@ class ReplicationGui
             }
 
             $_url_params['sr_slave_control_parm'] = 'SQL_THREAD';
-            $slave_control_sql_link = 'server_replication.php'
-                . Url::getCommon($_url_params);
+            $slave_control_sql_link = Url::getCommon($_url_params, '');
 
             if ($server_slave_replication[0]['Slave_IO_Running'] == 'No'
                 || $server_slave_replication[0]['Slave_SQL_Running'] == 'No'
@@ -226,18 +224,15 @@ class ReplicationGui
             }
 
             $_url_params['sr_slave_control_parm'] = null;
-            $slave_control_full_link = 'server_replication.php'
-                . Url::getCommon($_url_params);
+            $slave_control_full_link = Url::getCommon($_url_params, '');
 
             $_url_params['sr_slave_action'] = 'reset';
-            $slave_control_reset_link = 'server_replication.php'
-                . Url::getCommon($_url_params);
+            $slave_control_reset_link = Url::getCommon($_url_params, '');
 
             $_url_params = $GLOBALS['url_params'];
             $_url_params['sr_take_action'] = true;
             $_url_params['sr_slave_skip_error'] = true;
-            $slave_skip_error_link = 'server_replication.php'
-                . Url::getCommon($_url_params);
+            $slave_skip_error_link = Url::getCommon($_url_params, '');
 
             if ($server_slave_replication[0]['Slave_SQL_Running'] == 'No') {
                 $html .= Message::error(
@@ -254,8 +249,7 @@ class ReplicationGui
             $_url_params['sl_configure'] = true;
             $_url_params['repl_clear_scr'] = true;
 
-            $reconfiguremaster_link = 'server_replication.php'
-                . Url::getCommon($_url_params);
+            $reconfiguremaster_link =  Url::getCommon($_url_params, '');
 
             $html .= __(
                 'Server is configured as slave in a replication process. Would you ' .
@@ -272,26 +266,26 @@ class ReplicationGui
             $html .= __('Control slave:') . '</a>';
             $html .= ' <div id="slave_control_gui" class="hide">';
             $html .= '  <ul>';
-            $html .= '   <li><a href="' . $slave_control_full_link . '">';
+            $html .= '   <li><a href="server_replication.php" data-post="' . $slave_control_full_link . '">';
             $html .= (($server_slave_replication[0]['Slave_IO_Running'] == 'No' ||
                        $server_slave_replication[0]['Slave_SQL_Running'] == 'No')
                      ? __('Full start')
                      : __('Full stop')) . ' </a></li>';
             $html .= '   <li><a class="ajax" id="reset_slave"'
-                . ' href="' . $slave_control_reset_link . '">';
+                . ' href="server_replication.php" data-post="' . $slave_control_reset_link . '">';
             $html .= __('Reset slave') . '</a></li>';
             if ($server_slave_replication[0]['Slave_SQL_Running'] == 'No') {
-                $html .= '   <li><a href="' . $slave_control_sql_link . '">';
+                $html .= '   <li><a href="server_replication.php" data-post="' . $slave_control_sql_link . '">';
                 $html .= __('Start SQL Thread only') . '</a></li>';
             } else {
-                $html .= '   <li><a href="' . $slave_control_sql_link . '">';
+                $html .= '   <li><a href="server_replication.php" data-post="' . $slave_control_sql_link . '">';
                 $html .= __('Stop SQL Thread only') . '</a></li>';
             }
             if ($server_slave_replication[0]['Slave_IO_Running'] == 'No') {
-                $html .= '   <li><a href="' . $slave_control_io_link . '">';
+                $html .= '   <li><a href="server_replication.php" data-post="' . $slave_control_io_link . '">';
                 $html .= __('Start IO Thread only') . '</a></li>';
             } else {
-                $html .= '   <li><a href="' . $slave_control_io_link . '">';
+                $html .= '   <li><a href="server_replication.php" data-post="' . $slave_control_io_link . '">';
                 $html .= __('Stop IO Thread only') . '</a></li>';
             }
             $html .= '  </ul>';
@@ -300,11 +294,11 @@ class ReplicationGui
             $html .= ' <li>';
             $html .= $this->getHtmlForSlaveErrorManagement($slave_skip_error_link);
             $html .= ' </li>';
-            $html .= ' <li><a href="' . $reconfiguremaster_link . '">';
+            $html .= ' <li><a href="server_replication.php" data-post="' . $reconfiguremaster_link . '">';
             $html .=  __('Change or reconfigure master server') . '</a></li>';
             $html .= '</ul>';
             $html .= '</div>';
-        } elseif (! isset($_REQUEST['sl_configure'])) {
+        } elseif (! isset($_POST['sl_configure'])) {
             $_url_params = $GLOBALS['url_params'];
             $_url_params['sl_configure'] = true;
             $_url_params['repl_clear_scr'] = true;
@@ -312,9 +306,10 @@ class ReplicationGui
             $html .= sprintf(
                 __(
                     'This server is not configured as slave in a replication process. '
-                    . 'Would you like to <a href="%s">configure</a> it?'
+                    . 'Would you like to %sconfigure%s it?'
                 ),
-                'server_replication.php' . Url::getCommon($_url_params)
+                '<a href="server_replication.php" data-post="' . Url::getCommon($_url_params, '') . '">',
+                '</a>'
             );
         }
         $html .= '</fieldset>';
@@ -339,7 +334,7 @@ class ReplicationGui
             __('Skipping errors might lead into unsynchronized master and slave!')
         )->getDisplay();
         $html .= '  <ul>';
-        $html .= '   <li><a href="' . $slave_skip_error_link . '">';
+        $html .= '   <li><a href="server_replication.php" data-post="' . $slave_skip_error_link . '">';
         $html .= __('Skip current error') . '</a></li>';
         $html .= '   <li>';
         $html .= '    <form method="post" action="server_replication.php">';
@@ -373,9 +368,10 @@ class ReplicationGui
         $html .= sprintf(
             __(
                 'This server is not configured as master in a replication process. '
-                . 'Would you like to <a href="%s">configure</a> it?'
+                . 'Would you like to %sconfigure%s it?'
             ),
-            'server_replication.php' . Url::getCommon($_url_params)
+            '<a href="server_replication.php" data-post="' . Url::getCommon($_url_params, '') . '">',
+            '</a>'
         );
         $html .= '</fieldset>';
         return $html;
@@ -707,7 +703,7 @@ class ReplicationGui
         list($username_length, $hostname_length)
             = $this->getUsernameHostnameLength();
 
-        if (isset($_REQUEST['username']) && strlen($_REQUEST['username']) === 0) {
+        if (isset($_POST['username']) && strlen($_POST['username']) === 0) {
             $GLOBALS['pred_username'] = 'any';
         }
         $html .= '<div id="master_addslaveuser_gui">';
@@ -746,8 +742,8 @@ class ReplicationGui
         unset($_current_user);
 
         // when we start editing a user, $GLOBALS['pred_hostname'] is not defined
-        if (! isset($GLOBALS['pred_hostname']) && isset($_REQUEST['hostname'])) {
-            switch (mb_strtolower($_REQUEST['hostname'])) {
+        if (! isset($GLOBALS['pred_hostname']) && isset($_POST['hostname'])) {
+            switch (mb_strtolower($_POST['hostname'])) {
                 case 'localhost':
                 case '127.0.0.1':
                     $GLOBALS['pred_hostname'] = 'localhost';
@@ -824,10 +820,10 @@ class ReplicationGui
             . '</span>'
             . '<input type="text" name="username" id="pma_username" maxlength="'
             . $username_length . '" title="' . __('User name') . '"'
-            . (empty($_REQUEST['username']) ? '' : ' value="'
+            . (empty($_POST['username']) ? '' : ' value="'
             . (isset($GLOBALS['new_username'])
                 ? $GLOBALS['new_username']
-                : htmlspecialchars($_REQUEST['username'])) . '"')
+                : htmlspecialchars($_POST['username'])) . '"')
             . ' />'
             . '</div>';
 
@@ -857,7 +853,7 @@ class ReplicationGui
             . '</span>'
             . '<input type="text" name="hostname" id="pma_hostname" maxlength="'
             . $hostname_length . '" value="'
-            . (isset($_REQUEST['hostname']) ? htmlspecialchars($_REQUEST['hostname']) : '')
+            . (isset($_POST['hostname']) ? htmlspecialchars($_POST['hostname']) : '')
             . '" title="' . __('Host')
             . '" />'
             . Util::showHint(
@@ -875,12 +871,12 @@ class ReplicationGui
             . '    <select name="pred_password" id="select_pred_password" title="'
             . __('Password') . '">'
             . '        <option value="none"';
-        if (isset($_REQUEST['username'])) {
+        if (isset($_POST['username'])) {
             $html .= '  selected="selected"';
         }
         $html .= '>' . __('No Password') . '</option>'
             . '        <option value="userdefined"'
-            . (isset($_REQUEST['username']) ? '' : ' selected="selected"')
+            . (isset($_POST['username']) ? '' : ' selected="selected"')
             . '>' . __('Use text field:') . '</option>'
             . '    </select>'
             . '</span>'
@@ -921,22 +917,22 @@ class ReplicationGui
      */
     public function handleControlRequest()
     {
-        if (isset($_REQUEST['sr_take_action'])) {
+        if (isset($_POST['sr_take_action'])) {
             $refresh = false;
             $result = false;
             $messageSuccess = null;
             $messageError = null;
 
-            if (isset($_REQUEST['slave_changemaster']) && ! $GLOBALS['cfg']['AllowArbitraryServer']) {
+            if (isset($_POST['slave_changemaster']) && ! $GLOBALS['cfg']['AllowArbitraryServer']) {
                 $_SESSION['replication']['sr_action_status'] = 'error';
                 $_SESSION['replication']['sr_action_info'] = __('Connection to server is disabled, please enable $cfg[\'AllowArbitraryServer\'] in phpMyAdmin configuration.');
-            } elseif (isset($_REQUEST['slave_changemaster'])) {
+            } elseif (isset($_POST['slave_changemaster'])) {
                 $result = $this->handleRequestForSlaveChangeMaster();
-            } elseif (isset($_REQUEST['sr_slave_server_control'])) {
+            } elseif (isset($_POST['sr_slave_server_control'])) {
                 $result = $this->handleRequestForSlaveServerControl();
                 $refresh = true;
 
-                switch ($_REQUEST['sr_slave_action']) {
+                switch ($_POST['sr_slave_action']) {
                     case 'start':
                         $messageSuccess = __('Replication started successfully.');
                         $messageError = __('Error starting replication.');
@@ -954,7 +950,7 @@ class ReplicationGui
                         $messageError = __('Error.');
                         break;
                 }
-            } elseif (isset($_REQUEST['sr_slave_skip_error'])) {
+            } elseif (isset($_POST['sr_slave_skip_error'])) {
                 $result = $this->handleRequestForSlaveSkipError();
             }
 
@@ -988,13 +984,13 @@ class ReplicationGui
     {
         $sr = [];
         $_SESSION['replication']['m_username'] = $sr['username']
-            = $GLOBALS['dbi']->escapeString($_REQUEST['username']);
+            = $GLOBALS['dbi']->escapeString($_POST['username']);
         $_SESSION['replication']['m_password'] = $sr['pma_pw']
-            = $GLOBALS['dbi']->escapeString($_REQUEST['pma_pw']);
+            = $GLOBALS['dbi']->escapeString($_POST['pma_pw']);
         $_SESSION['replication']['m_hostname'] = $sr['hostname']
-            = $GLOBALS['dbi']->escapeString($_REQUEST['hostname']);
+            = $GLOBALS['dbi']->escapeString($_POST['hostname']);
         $_SESSION['replication']['m_port']     = $sr['port']
-            = $GLOBALS['dbi']->escapeString($_REQUEST['text_port']);
+            = $GLOBALS['dbi']->escapeString($_POST['text_port']);
         $_SESSION['replication']['m_correct']  = '';
         $_SESSION['replication']['sr_action_status'] = 'error';
         $_SESSION['replication']['sr_action_info'] = __('Unknown error');
@@ -1060,10 +1056,10 @@ class ReplicationGui
      */
     public function handleRequestForSlaveServerControl()
     {
-        if (empty($_REQUEST['sr_slave_control_parm'])) {
-            $_REQUEST['sr_slave_control_parm'] = null;
+        if (empty($_POST['sr_slave_control_parm'])) {
+            $_POST['sr_slave_control_parm'] = null;
         }
-        if ($_REQUEST['sr_slave_action'] == 'reset') {
+        if ($_POST['sr_slave_action'] == 'reset') {
             $qStop = $this->replication->slaveControl("STOP");
             $qReset = $GLOBALS['dbi']->tryQuery("RESET SLAVE;");
             $qStart = $this->replication->slaveControl("START");
@@ -1073,8 +1069,8 @@ class ReplicationGui
                 $qStart !== false && $qStart !== -1);
         } else {
             $qControl = $this->replication->slaveControl(
-                $_REQUEST['sr_slave_action'],
-                $_REQUEST['sr_slave_control_parm']
+                $_POST['sr_slave_action'],
+                $_POST['sr_slave_control_parm']
             );
 
             $result = ($qControl !== false && $qControl !== -1);
@@ -1091,8 +1087,8 @@ class ReplicationGui
     public function handleRequestForSlaveSkipError()
     {
         $count = 1;
-        if (isset($_REQUEST['sr_skip_errors_count'])) {
-            $count = $_REQUEST['sr_skip_errors_count'] * 1;
+        if (isset($_POST['sr_skip_errors_count'])) {
+            $count = $_POST['sr_skip_errors_count'] * 1;
         }
 
         $qStop = $this->replication->slaveControl("STOP");
diff --git a/libraries/classes/Rte/Events.php b/libraries/classes/Rte/Events.php
index e9a1a85914..3bf48f1e5d 100644
--- a/libraries/classes/Rte/Events.php
+++ b/libraries/classes/Rte/Events.php
@@ -153,8 +153,8 @@ class Events
     {
         global $_REQUEST, $_POST, $errors, $db;
 
-        if (! empty($_REQUEST['editor_process_add'])
-            || ! empty($_REQUEST['editor_process_edit'])
+        if (! empty($_POST['editor_process_add'])
+            || ! empty($_POST['editor_process_edit'])
         ) {
             $sql_query = '';
 
@@ -162,15 +162,15 @@ class Events
 
             if (! count($errors)) { // set by PhpMyAdmin\Rte\Routines::getQueryFromRequest()
                 // Execute the created query
-                if (! empty($_REQUEST['editor_process_edit'])) {
+                if (! empty($_POST['editor_process_edit'])) {
                     // Backup the old trigger, in case something goes wrong
                     $create_item = $this->dbi->getDefinition(
                         $db,
                         'EVENT',
-                        $_REQUEST['item_original_name']
+                        $_POST['item_original_name']
                     );
                     $drop_item = "DROP EVENT "
-                        . Util::backquote($_REQUEST['item_original_name'])
+                        . Util::backquote($_POST['item_original_name'])
                         . ";\n";
                     $result = $this->dbi->tryQuery($drop_item);
                     if (! $result) {
@@ -205,7 +205,7 @@ class Events
                                 __('Event %1$s has been modified.')
                             );
                             $message->addParam(
-                                Util::backquote($_REQUEST['item_name'])
+                                Util::backquote($_POST['item_name'])
                             );
                             $sql_query = $drop_item . $item_query;
                         }
@@ -225,7 +225,7 @@ class Events
                             __('Event %1$s has been created.')
                         );
                         $message->addParam(
-                            Util::backquote($_REQUEST['item_name'])
+                            Util::backquote($_POST['item_name'])
                         );
                         $sql_query = $item_query;
                     }
@@ -251,12 +251,12 @@ class Events
             $response = Response::getInstance();
             if ($response->isAjax()) {
                 if ($message->isSuccess()) {
-                    $events = $this->dbi->getEvents($db, $_REQUEST['item_name']);
+                    $events = $this->dbi->getEvents($db, $_POST['item_name']);
                     $event = $events[0];
                     $response->addJSON(
                         'name',
                         htmlspecialchars(
-                            mb_strtoupper($_REQUEST['item_name'])
+                            mb_strtoupper($_POST['item_name'])
                         )
                     );
                     if (! empty($event)) {
@@ -275,14 +275,14 @@ class Events
          * Display a form used to add/edit a trigger, if necessary
          */
         if (count($errors)
-            || (empty($_REQUEST['editor_process_add'])
-            && empty($_REQUEST['editor_process_edit'])
+            || (empty($_POST['editor_process_add'])
+            && empty($_POST['editor_process_edit'])
             && (! empty($_REQUEST['add_item'])
             || ! empty($_REQUEST['edit_item'])
-            || ! empty($_REQUEST['item_changetype'])))
+            || ! empty($_POST['item_changetype'])))
         ) { // FIXME: this must be simpler than that
             $operation = '';
-            if (! empty($_REQUEST['item_changetype'])) {
+            if (! empty($_POST['item_changetype'])) {
                 $operation = 'change';
             }
             // Get the data for the form (if any)
@@ -293,8 +293,8 @@ class Events
             } elseif (! empty($_REQUEST['edit_item'])) {
                 $title = __("Edit event");
                 if (! empty($_REQUEST['item_name'])
-                    && empty($_REQUEST['editor_process_edit'])
-                    && empty($_REQUEST['item_changetype'])
+                    && empty($_POST['editor_process_edit'])
+                    && empty($_POST['item_changetype'])
                 ) {
                     $item = $this->getDataFromName($_REQUEST['item_name']);
                     if ($item !== false) {
@@ -330,11 +330,11 @@ class Events
                          'item_comment',
                          'item_definer'];
         foreach ($indices as $index) {
-            $retval[$index] = isset($_REQUEST[$index]) ? $_REQUEST[$index] : '';
+            $retval[$index] = isset($_POST[$index]) ? $_POST[$index] : '';
         }
         $retval['item_type']        = 'ONE TIME';
         $retval['item_type_toggle'] = 'RECURRING';
-        if (isset($_REQUEST['item_type']) && $_REQUEST['item_type'] == 'RECURRING') {
+        if (isset($_POST['item_type']) && $_POST['item_type'] == 'RECURRING') {
             $retval['item_type']        = 'RECURRING';
             $retval['item_type_toggle'] = 'ONE TIME';
         }
@@ -599,10 +599,10 @@ class Events
         global $_REQUEST, $errors, $event_status, $event_type, $event_interval;
 
         $query = 'CREATE ';
-        if (! empty($_REQUEST['item_definer'])) {
-            if (mb_strpos($_REQUEST['item_definer'], '@') !== false
+        if (! empty($_POST['item_definer'])) {
+            if (mb_strpos($_POST['item_definer'], '@') !== false
             ) {
-                $arr = explode('@', $_REQUEST['item_definer']);
+                $arr = explode('@', $_POST['item_definer']);
                 $query .= 'DEFINER=' . Util::backquote($arr[0]);
                 $query .= '@' . Util::backquote($arr[1]) . ' ';
             } else {
@@ -610,40 +610,40 @@ class Events
             }
         }
         $query .= 'EVENT ';
-        if (! empty($_REQUEST['item_name'])) {
-            $query .= Util::backquote($_REQUEST['item_name']) . ' ';
+        if (! empty($_POST['item_name'])) {
+            $query .= Util::backquote($_POST['item_name']) . ' ';
         } else {
             $errors[] = __('You must provide an event name!');
         }
         $query .= 'ON SCHEDULE ';
-        if (! empty($_REQUEST['item_type'])
-            && in_array($_REQUEST['item_type'], $event_type)
+        if (! empty($_POST['item_type'])
+            && in_array($_POST['item_type'], $event_type)
         ) {
-            if ($_REQUEST['item_type'] == 'RECURRING') {
-                if (! empty($_REQUEST['item_interval_value'])
-                    && !empty($_REQUEST['item_interval_field'])
-                    && in_array($_REQUEST['item_interval_field'], $event_interval)
+            if ($_POST['item_type'] == 'RECURRING') {
+                if (! empty($_POST['item_interval_value'])
+                    && !empty($_POST['item_interval_field'])
+                    && in_array($_POST['item_interval_field'], $event_interval)
                 ) {
-                    $query .= 'EVERY ' . intval($_REQUEST['item_interval_value']) . ' ';
-                    $query .= $_REQUEST['item_interval_field'] . ' ';
+                    $query .= 'EVERY ' . intval($_POST['item_interval_value']) . ' ';
+                    $query .= $_POST['item_interval_field'] . ' ';
                 } else {
                     $errors[]
                         = __('You must provide a valid interval value for the event.');
                 }
-                if (! empty($_REQUEST['item_starts'])) {
+                if (! empty($_POST['item_starts'])) {
                     $query .= "STARTS '"
-                        . $this->dbi->escapeString($_REQUEST['item_starts'])
+                        . $this->dbi->escapeString($_POST['item_starts'])
                         . "' ";
                 }
-                if (! empty($_REQUEST['item_ends'])) {
+                if (! empty($_POST['item_ends'])) {
                     $query .= "ENDS '"
-                        . $this->dbi->escapeString($_REQUEST['item_ends'])
+                        . $this->dbi->escapeString($_POST['item_ends'])
                         . "' ";
                 }
             } else {
-                if (! empty($_REQUEST['item_execute_at'])) {
+                if (! empty($_POST['item_execute_at'])) {
                     $query .= "AT '"
-                        . $this->dbi->escapeString($_REQUEST['item_execute_at'])
+                        . $this->dbi->escapeString($_POST['item_execute_at'])
                         . "' ";
                 } else {
                     $errors[]
@@ -654,26 +654,26 @@ class Events
             $errors[] = __('You must provide a valid type for the event.');
         }
         $query .= 'ON COMPLETION ';
-        if (empty($_REQUEST['item_preserve'])) {
+        if (empty($_POST['item_preserve'])) {
             $query .= 'NOT ';
         }
         $query .= 'PRESERVE ';
-        if (! empty($_REQUEST['item_status'])) {
+        if (! empty($_POST['item_status'])) {
             foreach ($event_status['display'] as $key => $value) {
-                if ($value == $_REQUEST['item_status']) {
+                if ($value == $_POST['item_status']) {
                     $query .= $event_status['query'][$key] . ' ';
                     break;
                 }
             }
         }
-        if (! empty($_REQUEST['item_comment'])) {
+        if (! empty($_POST['item_comment'])) {
             $query .= "COMMENT '" . $this->dbi->escapeString(
-                $_REQUEST['item_comment']
+                $_POST['item_comment']
             ) . "' ";
         }
         $query .= 'DO ';
-        if (! empty($_REQUEST['item_definition'])) {
-            $query .= $_REQUEST['item_definition'];
+        if (! empty($_POST['item_definition'])) {
+            $query .= $_POST['item_definition'];
         } else {
             $errors[] = __('You must provide an event definition.');
         }
diff --git a/libraries/classes/Rte/Routines.php b/libraries/classes/Rte/Routines.php
index 6006906eb9..7bd70b0526 100644
--- a/libraries/classes/Rte/Routines.php
+++ b/libraries/classes/Rte/Routines.php
@@ -170,21 +170,21 @@ class Routines
          */
         // FIXME: this must be simpler than that
         if (count($errors)
-            || ( empty($_REQUEST['editor_process_add'])
-            && empty($_REQUEST['editor_process_edit'])
+            || ( empty($_POST['editor_process_add'])
+            && empty($_POST['editor_process_edit'])
             && (! empty($_REQUEST['add_item']) || ! empty($_REQUEST['edit_item'])
-            || ! empty($_REQUEST['routine_addparameter'])
-            || ! empty($_REQUEST['routine_removeparameter'])
-            || ! empty($_REQUEST['routine_changetype'])))
+            || ! empty($_POST['routine_addparameter'])
+            || ! empty($_POST['routine_removeparameter'])
+            || ! empty($_POST['routine_changetype'])))
         ) {
             // Handle requests to add/remove parameters and changing routine type
             // This is necessary when JS is disabled
             $operation = '';
-            if (! empty($_REQUEST['routine_addparameter'])) {
+            if (! empty($_POST['routine_addparameter'])) {
                 $operation = 'add';
-            } elseif (! empty($_REQUEST['routine_removeparameter'])) {
+            } elseif (! empty($_POST['routine_removeparameter'])) {
                 $operation = 'remove';
-            } elseif (! empty($_REQUEST['routine_changetype'])) {
+            } elseif (! empty($_POST['routine_changetype'])) {
                 $operation = 'change';
             }
             // Get the data for the form (if any)
@@ -194,12 +194,12 @@ class Routines
                 $mode = 'add';
             } elseif (! empty($_REQUEST['edit_item'])) {
                 $title = __("Edit routine");
-                if (! $operation && ! empty($_REQUEST['item_name'])
-                    && empty($_REQUEST['editor_process_edit'])
+                if (! $operation && ! empty($_GET['item_name'])
+                    && empty($_POST['editor_process_edit'])
                 ) {
                     $routine = $this->getDataFromName(
-                        $_REQUEST['item_name'],
-                        $_REQUEST['item_type']
+                        $_GET['item_name'],
+                        $_GET['item_type']
                     );
                     if ($routine !== false) {
                         $routine['item_original_name'] = $routine['item_name'];
@@ -254,8 +254,8 @@ class Routines
      */
     public function handleRequestCreateOrEdit(array $errors, $db)
     {
-        if (empty($_REQUEST['editor_process_add'])
-            && empty($_REQUEST['editor_process_edit'])
+        if (empty($_POST['editor_process_add'])
+            && empty($_POST['editor_process_edit'])
         ) {
             return $errors;
         }
@@ -264,29 +264,29 @@ class Routines
         $routine_query = $this->getQueryFromRequest();
         if (!count($errors)) {
             // Execute the created query
-            if (!empty($_REQUEST['editor_process_edit'])) {
+            if (!empty($_POST['editor_process_edit'])) {
                 $isProcOrFunc = in_array(
-                    $_REQUEST['item_original_type'],
+                    $_POST['item_original_type'],
                     ['PROCEDURE', 'FUNCTION']
                 );
 
                 if (!$isProcOrFunc) {
                     $errors[] = sprintf(
                         __('Invalid routine type: "%s"'),
-                        htmlspecialchars($_REQUEST['item_original_type'])
+                        htmlspecialchars($_POST['item_original_type'])
                     );
                 } else {
                     // Backup the old routine, in case something goes wrong
                     $create_routine = $this->dbi->getDefinition(
                         $db,
-                        $_REQUEST['item_original_type'],
-                        $_REQUEST['item_original_name']
+                        $_POST['item_original_type'],
+                        $_POST['item_original_name']
                     );
 
                     $privilegesBackup = $this->backupPrivileges();
 
-                    $drop_routine = "DROP {$_REQUEST['item_original_type']} "
-                        . Util::backquote($_REQUEST['item_original_name'])
+                    $drop_routine = "DROP {$_POST['item_original_type']} "
+                        . Util::backquote($_POST['item_original_name'])
                         . ";\n";
                     $result = $this->dbi->tryQuery($drop_routine);
                     if (!$result) {
@@ -328,7 +328,7 @@ class Routines
                         __('Routine %1$s has been created.')
                     );
                     $message->addParam(
-                        Util::backquote($_REQUEST['item_name'])
+                        Util::backquote($_POST['item_name'])
                     );
                     $sql_query = $routine_query;
                 }
@@ -363,14 +363,14 @@ class Routines
 
         $routines = $this->dbi->getRoutines(
             $db,
-            $_REQUEST['item_type'],
-            $_REQUEST['item_name']
+            $_POST['item_type'],
+            $_POST['item_name']
         );
         $routine = $routines[0];
         $response->addJSON(
             'name',
             htmlspecialchars(
-                mb_strtoupper($_REQUEST['item_name'])
+                mb_strtoupper($_POST['item_name'])
             )
         );
         $response->addJSON('new_row', $this->rteList->getRoutineRow($routine));
@@ -391,9 +391,9 @@ class Routines
         }
 
         // Backup the Old Privileges before dropping
-        // if $_REQUEST['item_adjust_privileges'] set
-        if (! isset($_REQUEST['item_adjust_privileges'])
-            || empty($_REQUEST['item_adjust_privileges'])
+        // if $_POST['item_adjust_privileges'] set
+        if (! isset($_POST['item_adjust_privileges'])
+            || empty($_POST['item_adjust_privileges'])
         ) {
             return [];
         }
@@ -402,8 +402,8 @@ class Routines
             'mysql'
         )
         . '.' . Util::backquote('procs_priv')
-        . ' where Routine_name = "' . $_REQUEST['item_original_name']
-        . '" AND Routine_type = "' . $_REQUEST['item_original_type']
+        . ' where Routine_name = "' . $_POST['item_original_name']
+        . '" AND Routine_type = "' . $_POST['item_original_type']
         . '";';
 
         $privilegesBackup = $this->dbi->fetchResult(
@@ -468,8 +468,8 @@ class Routines
                     . Util::backquote('procs_priv')
                     . ' VALUES("' . $priv[0] . '", "'
                     . $priv[1] . '", "' . $priv[2] . '", "'
-                    . $_REQUEST['item_name'] . '", "'
-                    . $_REQUEST['item_type'] . '", "'
+                    . $_POST['item_name'] . '", "'
+                    . $_POST['item_type'] . '", "'
                     . $priv[5] . '", "'
                     . $priv[6] . '", "'
                     . $priv[7] . '");';
@@ -509,7 +509,7 @@ class Routines
             );
         }
         $message->addParam(
-            Util::backquote($_REQUEST['item_name'])
+            Util::backquote($_POST['item_name'])
         );
 
         return $message;
@@ -537,7 +537,7 @@ class Routines
                          'item_comment',
                          'item_definer'];
         foreach ($indices as $index) {
-            $retval[$index] = isset($_REQUEST[$index]) ? $_REQUEST[$index] : '';
+            $retval[$index] = isset($_POST[$index]) ? $_POST[$index] : '';
         }
 
         $retval['item_type']         = 'PROCEDURE';
@@ -547,8 +547,8 @@ class Routines
             $retval['item_type_toggle']  = 'PROCEDURE';
         }
         $retval['item_original_type'] = 'PROCEDURE';
-        if (isset($_REQUEST['item_original_type'])
-            && $_REQUEST['item_original_type'] == 'FUNCTION'
+        if (isset($_POST['item_original_type'])
+            && $_POST['item_original_type'] == 'FUNCTION'
         ) {
             $retval['item_original_type'] = 'FUNCTION';
         }
@@ -559,35 +559,35 @@ class Routines
         $retval['item_param_length']    = [];
         $retval['item_param_opts_num']  = [];
         $retval['item_param_opts_text'] = [];
-        if (isset($_REQUEST['item_param_name'])
-            && isset($_REQUEST['item_param_type'])
-            && isset($_REQUEST['item_param_length'])
-            && isset($_REQUEST['item_param_opts_num'])
-            && isset($_REQUEST['item_param_opts_text'])
-            && is_array($_REQUEST['item_param_name'])
-            && is_array($_REQUEST['item_param_type'])
-            && is_array($_REQUEST['item_param_length'])
-            && is_array($_REQUEST['item_param_opts_num'])
-            && is_array($_REQUEST['item_param_opts_text'])
+        if (isset($_POST['item_param_name'])
+            && isset($_POST['item_param_type'])
+            && isset($_POST['item_param_length'])
+            && isset($_POST['item_param_opts_num'])
+            && isset($_POST['item_param_opts_text'])
+            && is_array($_POST['item_param_name'])
+            && is_array($_POST['item_param_type'])
+            && is_array($_POST['item_param_length'])
+            && is_array($_POST['item_param_opts_num'])
+            && is_array($_POST['item_param_opts_text'])
         ) {
-            if ($_REQUEST['item_type'] == 'PROCEDURE') {
-                $retval['item_param_dir'] = $_REQUEST['item_param_dir'];
+            if ($_POST['item_type'] == 'PROCEDURE') {
+                $retval['item_param_dir'] = $_POST['item_param_dir'];
                 foreach ($retval['item_param_dir'] as $key => $value) {
                     if (! in_array($value, $param_directions, true)) {
                         $retval['item_param_dir'][$key] = '';
                     }
                 }
             }
-            $retval['item_param_name'] = $_REQUEST['item_param_name'];
-            $retval['item_param_type'] = $_REQUEST['item_param_type'];
+            $retval['item_param_name'] = $_POST['item_param_name'];
+            $retval['item_param_type'] = $_POST['item_param_type'];
             foreach ($retval['item_param_type'] as $key => $value) {
                 if (! in_array($value, Util::getSupportedDatatypes(), true)) {
                     $retval['item_param_type'][$key] = '';
                 }
             }
-            $retval['item_param_length']    = $_REQUEST['item_param_length'];
-            $retval['item_param_opts_num']  = $_REQUEST['item_param_opts_num'];
-            $retval['item_param_opts_text'] = $_REQUEST['item_param_opts_text'];
+            $retval['item_param_length']    = $_POST['item_param_length'];
+            $retval['item_param_opts_num']  = $_POST['item_param_opts_num'];
+            $retval['item_param_opts_text'] = $_POST['item_param_opts_text'];
             $retval['item_num_params'] = max(
                 count($retval['item_param_name']),
                 count($retval['item_param_type']),
@@ -597,32 +597,32 @@ class Routines
             );
         }
         $retval['item_returntype'] = '';
-        if (isset($_REQUEST['item_returntype'])
-            && in_array($_REQUEST['item_returntype'], Util::getSupportedDatatypes())
+        if (isset($_POST['item_returntype'])
+            && in_array($_POST['item_returntype'], Util::getSupportedDatatypes())
         ) {
-            $retval['item_returntype'] = $_REQUEST['item_returntype'];
+            $retval['item_returntype'] = $_POST['item_returntype'];
         }
 
         $retval['item_isdeterministic'] = '';
-        if (isset($_REQUEST['item_isdeterministic'])
-            && mb_strtolower($_REQUEST['item_isdeterministic']) == 'on'
+        if (isset($_POST['item_isdeterministic'])
+            && mb_strtolower($_POST['item_isdeterministic']) == 'on'
         ) {
             $retval['item_isdeterministic'] = " checked='checked'";
         }
         $retval['item_securitytype_definer'] = '';
         $retval['item_securitytype_invoker'] = '';
-        if (isset($_REQUEST['item_securitytype'])) {
-            if ($_REQUEST['item_securitytype'] === 'DEFINER') {
+        if (isset($_POST['item_securitytype'])) {
+            if ($_POST['item_securitytype'] === 'DEFINER') {
                 $retval['item_securitytype_definer'] = " selected='selected'";
-            } elseif ($_REQUEST['item_securitytype'] === 'INVOKER') {
+            } elseif ($_POST['item_securitytype'] === 'INVOKER') {
                 $retval['item_securitytype_invoker'] = " selected='selected'";
             }
         }
         $retval['item_sqldataaccess'] = '';
-        if (isset($_REQUEST['item_sqldataaccess'])
-            && in_array($_REQUEST['item_sqldataaccess'], $param_sqldataaccess, true)
+        if (isset($_POST['item_sqldataaccess'])
+            && in_array($_POST['item_sqldataaccess'], $param_sqldataaccess, true)
         ) {
-            $retval['item_sqldataaccess'] = $_REQUEST['item_sqldataaccess'];
+            $retval['item_sqldataaccess'] = $_POST['item_sqldataaccess'];
         }
 
         return $retval;
@@ -1151,13 +1151,13 @@ class Routines
     {
         global $_REQUEST, $errors, $param_sqldataaccess, $param_directions, $dbi;
 
-        $_REQUEST['item_type'] = isset($_REQUEST['item_type'])
-            ? $_REQUEST['item_type'] : '';
+        $_POST['item_type'] = isset($_POST['item_type'])
+            ? $_POST['item_type'] : '';
 
         $query = 'CREATE ';
-        if (! empty($_REQUEST['item_definer'])) {
-            if (mb_strpos($_REQUEST['item_definer'], '@') !== false) {
-                $arr = explode('@', $_REQUEST['item_definer']);
+        if (! empty($_POST['item_definer'])) {
+            if (mb_strpos($_POST['item_definer'], '@') !== false) {
+                $arr = explode('@', $_POST['item_definer']);
 
                 $do_backquote = true;
                 if (substr($arr[0], 0, 1) === "`"
@@ -1178,18 +1178,18 @@ class Routines
                 $errors[] = __('The definer must be in the "username@hostname" format!');
             }
         }
-        if ($_REQUEST['item_type'] == 'FUNCTION'
-            || $_REQUEST['item_type'] == 'PROCEDURE'
+        if ($_POST['item_type'] == 'FUNCTION'
+            || $_POST['item_type'] == 'PROCEDURE'
         ) {
-            $query .= $_REQUEST['item_type'] . ' ';
+            $query .= $_POST['item_type'] . ' ';
         } else {
             $errors[] = sprintf(
                 __('Invalid routine type: "%s"'),
-                htmlspecialchars($_REQUEST['item_type'])
+                htmlspecialchars($_POST['item_type'])
             );
         }
-        if (! empty($_REQUEST['item_name'])) {
-            $query .= Util::backquote($_REQUEST['item_name']);
+        if (! empty($_POST['item_name'])) {
+            $query .= Util::backquote($_POST['item_name']);
         } else {
             $errors[] = __('You must provide a routine name!');
         }
@@ -1197,36 +1197,36 @@ class Routines
         $warned_about_dir    = false;
         $warned_about_length = false;
 
-        if (! empty($_REQUEST['item_param_name'])
-            && ! empty($_REQUEST['item_param_type'])
-            && ! empty($_REQUEST['item_param_length'])
-            && is_array($_REQUEST['item_param_name'])
-            && is_array($_REQUEST['item_param_type'])
-            && is_array($_REQUEST['item_param_length'])
+        if (! empty($_POST['item_param_name'])
+            && ! empty($_POST['item_param_type'])
+            && ! empty($_POST['item_param_length'])
+            && is_array($_POST['item_param_name'])
+            && is_array($_POST['item_param_type'])
+            && is_array($_POST['item_param_length'])
         ) {
-            $item_param_name = $_REQUEST['item_param_name'];
-            $item_param_type = $_REQUEST['item_param_type'];
-            $item_param_length = $_REQUEST['item_param_length'];
+            $item_param_name = $_POST['item_param_name'];
+            $item_param_type = $_POST['item_param_type'];
+            $item_param_length = $_POST['item_param_length'];
 
             for ($i = 0, $nb = count($item_param_name); $i < $nb; $i++) {
                 if (! empty($item_param_name[$i])
                     && ! empty($item_param_type[$i])
                 ) {
-                    if ($_REQUEST['item_type'] == 'PROCEDURE'
-                        && ! empty($_REQUEST['item_param_dir'][$i])
-                        && in_array($_REQUEST['item_param_dir'][$i], $param_directions)
+                    if ($_POST['item_type'] == 'PROCEDURE'
+                        && ! empty($_POST['item_param_dir'][$i])
+                        && in_array($_POST['item_param_dir'][$i], $param_directions)
                     ) {
-                        $params .= $_REQUEST['item_param_dir'][$i] . " "
+                        $params .= $_POST['item_param_dir'][$i] . " "
                             . Util::backquote($item_param_name[$i])
                             . " " . $item_param_type[$i];
-                    } elseif ($_REQUEST['item_type'] == 'FUNCTION') {
+                    } elseif ($_POST['item_type'] == 'FUNCTION') {
                         $params .= Util::backquote($item_param_name[$i])
                             . " " . $item_param_type[$i];
                     } elseif (! $warned_about_dir) {
                         $warned_about_dir = true;
                         $errors[] = sprintf(
                             __('Invalid direction "%s" given for parameter.'),
-                            htmlspecialchars($_REQUEST['item_param_dir'][$i])
+                            htmlspecialchars($_POST['item_param_dir'][$i])
                         );
                     }
                     if ($item_param_length[$i] != ''
@@ -1252,21 +1252,21 @@ class Routines
                             );
                         }
                     }
-                    if (! empty($_REQUEST['item_param_opts_text'][$i])) {
+                    if (! empty($_POST['item_param_opts_text'][$i])) {
                         if ($dbi->types->getTypeClass($item_param_type[$i]) == 'CHAR') {
                             if (! in_array($item_param_type[$i], ['VARBINARY', 'BINARY'])) {
                                 $params .= ' CHARSET '
                                     . mb_strtolower(
-                                        $_REQUEST['item_param_opts_text'][$i]
+                                        $_POST['item_param_opts_text'][$i]
                                     );
                             }
                         }
                     }
-                    if (! empty($_REQUEST['item_param_opts_num'][$i])) {
+                    if (! empty($_POST['item_param_opts_num'][$i])) {
                         if ($dbi->types->getTypeClass($item_param_type[$i]) == 'NUMBER') {
                             $params .= ' '
                                 . mb_strtoupper(
-                                    $_REQUEST['item_param_opts_num'][$i]
+                                    $_POST['item_param_opts_num'][$i]
                                 );
                         }
                     }
@@ -1282,9 +1282,9 @@ class Routines
             }
         }
         $query .= "(" . $params . ") ";
-        if ($_REQUEST['item_type'] == 'FUNCTION') {
-            $item_returntype = isset($_REQUEST['item_returntype'])
-                ? $_REQUEST['item_returntype']
+        if ($_POST['item_type'] == 'FUNCTION') {
+            $item_returntype = isset($_POST['item_returntype'])
+                ? $_POST['item_returntype']
                 : null;
 
             if (! empty($item_returntype)
@@ -1297,15 +1297,15 @@ class Routines
             } else {
                 $errors[] = __('You must provide a valid return type for the routine.');
             }
-            if (! empty($_REQUEST['item_returnlength'])
+            if (! empty($_POST['item_returnlength'])
                 && !preg_match(
                     '@^(DATE|DATETIME|TIME|TINYBLOB|TINYTEXT|BLOB|TEXT|'
                     . 'MEDIUMBLOB|MEDIUMTEXT|LONGBLOB|LONGTEXT|SERIAL|BOOLEAN)$@i',
                     $item_returntype
                 )
             ) {
-                $query .= "(" . $_REQUEST['item_returnlength'] . ")";
-            } elseif (empty($_REQUEST['item_returnlength'])
+                $query .= "(" . $_POST['item_returnlength'] . ")";
+            } elseif (empty($_POST['item_returnlength'])
                 && preg_match(
                     '@^(ENUM|SET|VARCHAR|VARBINARY)$@i',
                     $item_returntype
@@ -1318,43 +1318,43 @@ class Routines
                     );
                 }
             }
-            if (! empty($_REQUEST['item_returnopts_text'])) {
+            if (! empty($_POST['item_returnopts_text'])) {
                 if ($dbi->types->getTypeClass($item_returntype) == 'CHAR') {
                     $query .= ' CHARSET '
-                        . mb_strtolower($_REQUEST['item_returnopts_text']);
+                        . mb_strtolower($_POST['item_returnopts_text']);
                 }
             }
-            if (! empty($_REQUEST['item_returnopts_num'])) {
+            if (! empty($_POST['item_returnopts_num'])) {
                 if ($dbi->types->getTypeClass($item_returntype) == 'NUMBER') {
                     $query .= ' '
-                        . mb_strtoupper($_REQUEST['item_returnopts_num']);
+                        . mb_strtoupper($_POST['item_returnopts_num']);
                 }
             }
             $query .= ' ';
         }
-        if (! empty($_REQUEST['item_comment'])) {
-            $query .= "COMMENT '" . $this->dbi->escapeString($_REQUEST['item_comment'])
+        if (! empty($_POST['item_comment'])) {
+            $query .= "COMMENT '" . $this->dbi->escapeString($_POST['item_comment'])
                 . "' ";
         }
-        if (isset($_REQUEST['item_isdeterministic'])) {
+        if (isset($_POST['item_isdeterministic'])) {
             $query .= 'DETERMINISTIC ';
         } else {
             $query .= 'NOT DETERMINISTIC ';
         }
-        if (! empty($_REQUEST['item_sqldataaccess'])
-            && in_array($_REQUEST['item_sqldataaccess'], $param_sqldataaccess)
+        if (! empty($_POST['item_sqldataaccess'])
+            && in_array($_POST['item_sqldataaccess'], $param_sqldataaccess)
         ) {
-            $query .= $_REQUEST['item_sqldataaccess'] . ' ';
+            $query .= $_POST['item_sqldataaccess'] . ' ';
         }
-        if (! empty($_REQUEST['item_securitytype'])) {
-            if ($_REQUEST['item_securitytype'] == 'DEFINER'
-                || $_REQUEST['item_securitytype'] == 'INVOKER'
+        if (! empty($_POST['item_securitytype'])) {
+            if ($_POST['item_securitytype'] == 'DEFINER'
+                || $_POST['item_securitytype'] == 'INVOKER'
             ) {
-                $query .= 'SQL SECURITY ' . $_REQUEST['item_securitytype'] . ' ';
+                $query .= 'SQL SECURITY ' . $_POST['item_securitytype'] . ' ';
             }
         }
-        if (! empty($_REQUEST['item_definition'])) {
-            $query .= $_REQUEST['item_definition'];
+        if (! empty($_POST['item_definition'])) {
+            $query .= $_POST['item_definition'];
         } else {
             $errors[] = __('You must provide a routine definition.');
         }
@@ -1376,18 +1376,18 @@ class Routines
         /**
          * Handle all user requests other than the default of listing routines
          */
-        if (! empty($_REQUEST['execute_routine']) && ! empty($_REQUEST['item_name'])) {
+        if (! empty($_POST['execute_routine']) && ! empty($_POST['item_name'])) {
             // Build the queries
             $routine = $this->getDataFromName(
-                $_REQUEST['item_name'],
-                $_REQUEST['item_type'],
+                $_POST['item_name'],
+                $_POST['item_type'],
                 false
             );
             if ($routine === false) {
                 $message  = __('Error in processing request:') . ' ';
                 $message .= sprintf(
                     $this->words->get('not_found'),
-                    htmlspecialchars(Util::backquote($_REQUEST['item_name'])),
+                    htmlspecialchars(Util::backquote($_POST['item_name'])),
                     htmlspecialchars(Util::backquote($db))
                 );
                 $message = Message::error($message);
@@ -1406,20 +1406,20 @@ class Routines
             $args      = [];
             $all_functions = $this->dbi->types->getAllFunctions();
             for ($i = 0; $i < $routine['item_num_params']; $i++) {
-                if (isset($_REQUEST['params'][$routine['item_param_name'][$i]])) {
-                    $value = $_REQUEST['params'][$routine['item_param_name'][$i]];
+                if (isset($_POST['params'][$routine['item_param_name'][$i]])) {
+                    $value = $_POST['params'][$routine['item_param_name'][$i]];
                     if (is_array($value)) { // is SET type
                         $value = implode(',', $value);
                     }
                     $value = $this->dbi->escapeString($value);
-                    if (! empty($_REQUEST['funcs'][$routine['item_param_name'][$i]])
+                    if (! empty($_POST['funcs'][$routine['item_param_name'][$i]])
                         && in_array(
-                            $_REQUEST['funcs'][$routine['item_param_name'][$i]],
+                            $_POST['funcs'][$routine['item_param_name'][$i]],
                             $all_functions
                         )
                     ) {
                         $queries[] = "SET @p$i="
-                            . $_REQUEST['funcs'][$routine['item_param_name'][$i]]
+                            . $_POST['funcs'][$routine['item_param_name'][$i]]
                             . "('$value');\n";
                     } else {
                         $queries[] = "SET @p$i='$value';\n";
@@ -1592,7 +1592,7 @@ class Routines
                 $message  = __('Error in processing request:') . ' ';
                 $message .= sprintf(
                     $this->words->get('not_found'),
-                    htmlspecialchars(Util::backquote($_REQUEST['item_name'])),
+                    htmlspecialchars(Util::backquote($_GET['item_name'])),
                     htmlspecialchars(Util::backquote($db))
                 );
                 $message = Message::error($message);
diff --git a/libraries/classes/Rte/Triggers.php b/libraries/classes/Rte/Triggers.php
index 8412b7dfdb..3e90b931ae 100644
--- a/libraries/classes/Rte/Triggers.php
+++ b/libraries/classes/Rte/Triggers.php
@@ -129,8 +129,8 @@ class Triggers
     {
         global $_REQUEST, $_POST, $errors, $db, $table;
 
-        if (! empty($_REQUEST['editor_process_add'])
-            || ! empty($_REQUEST['editor_process_edit'])
+        if (! empty($_POST['editor_process_add'])
+            || ! empty($_POST['editor_process_edit'])
         ) {
             $sql_query = '';
 
@@ -138,9 +138,9 @@ class Triggers
 
             if (! count($errors)) { // set by PhpMyAdmin\Rte\Routines::getQueryFromRequest()
                 // Execute the created query
-                if (! empty($_REQUEST['editor_process_edit'])) {
+                if (! empty($_POST['editor_process_edit'])) {
                     // Backup the old trigger, in case something goes wrong
-                    $trigger = $this->getDataFromName($_REQUEST['item_original_name']);
+                    $trigger = $this->getDataFromName($_POST['item_original_name']);
                     $create_item = $trigger['create'];
                     $drop_item = $trigger['drop'] . ';';
                     $result = $this->dbi->tryQuery($drop_item);
@@ -177,7 +177,7 @@ class Triggers
                                 __('Trigger %1$s has been modified.')
                             );
                             $message->addParam(
-                                Util::backquote($_REQUEST['item_name'])
+                                Util::backquote($_POST['item_name'])
                             );
                             $sql_query = $drop_item . $item_query;
                         }
@@ -197,7 +197,7 @@ class Triggers
                             __('Trigger %1$s has been created.')
                         );
                         $message->addParam(
-                            Util::backquote($_REQUEST['item_name'])
+                            Util::backquote($_POST['item_name'])
                         );
                         $sql_query = $item_query;
                     }
@@ -226,7 +226,7 @@ class Triggers
                     $items = $this->dbi->getTriggers($db, $table, '');
                     $trigger = false;
                     foreach ($items as $value) {
-                        if ($value['name'] == $_REQUEST['item_name']) {
+                        if ($value['name'] == $_POST['item_name']) {
                             $trigger = $value;
                         }
                     }
@@ -240,7 +240,7 @@ class Triggers
                             'name',
                             htmlspecialchars(
                                 mb_strtoupper(
-                                    $_REQUEST['item_name']
+                                    $_POST['item_name']
                                 )
                             )
                         );
@@ -259,8 +259,8 @@ class Triggers
          * Display a form used to add/edit a trigger, if necessary
          */
         if (count($errors)
-            || (empty($_REQUEST['editor_process_add'])
-            && empty($_REQUEST['editor_process_edit'])
+            || (empty($_POST['editor_process_add'])
+            && empty($_POST['editor_process_edit'])
             && (! empty($_REQUEST['add_item'])
             || ! empty($_REQUEST['edit_item']))) // FIXME: this must be simpler than that
         ) {
@@ -272,7 +272,7 @@ class Triggers
             } elseif (! empty($_REQUEST['edit_item'])) {
                 $title = __("Edit trigger");
                 if (! empty($_REQUEST['item_name'])
-                    && empty($_REQUEST['editor_process_edit'])
+                    && empty($_POST['editor_process_edit'])
                 ) {
                     $item = $this->getDataFromName($_REQUEST['item_name']);
                     if ($item !== false) {
@@ -303,7 +303,7 @@ class Triggers
                          'item_definition',
                          'item_definer'];
         foreach ($indices as $index) {
-            $retval[$index] = isset($_REQUEST[$index]) ? $_REQUEST[$index] : '';
+            $retval[$index] = isset($_POST[$index]) ? $_POST[$index] : '';
         }
         return $retval;
     }
@@ -480,10 +480,10 @@ class Triggers
         global $_REQUEST, $db, $errors, $action_timings, $event_manipulations;
 
         $query = 'CREATE ';
-        if (! empty($_REQUEST['item_definer'])) {
-            if (mb_strpos($_REQUEST['item_definer'], '@') !== false
+        if (! empty($_POST['item_definer'])) {
+            if (mb_strpos($_POST['item_definer'], '@') !== false
             ) {
-                $arr = explode('@', $_REQUEST['item_definer']);
+                $arr = explode('@', $_POST['item_definer']);
                 $query .= 'DEFINER=' . Util::backquote($arr[0]);
                 $query .= '@' . Util::backquote($arr[1]) . ' ';
             } else {
@@ -491,36 +491,36 @@ class Triggers
             }
         }
         $query .= 'TRIGGER ';
-        if (! empty($_REQUEST['item_name'])) {
-            $query .= Util::backquote($_REQUEST['item_name']) . ' ';
+        if (! empty($_POST['item_name'])) {
+            $query .= Util::backquote($_POST['item_name']) . ' ';
         } else {
             $errors[] = __('You must provide a trigger name!');
         }
-        if (! empty($_REQUEST['item_timing'])
-            && in_array($_REQUEST['item_timing'], $action_timings)
+        if (! empty($_POST['item_timing'])
+            && in_array($_POST['item_timing'], $action_timings)
         ) {
-            $query .= $_REQUEST['item_timing'] . ' ';
+            $query .= $_POST['item_timing'] . ' ';
         } else {
             $errors[] = __('You must provide a valid timing for the trigger!');
         }
-        if (! empty($_REQUEST['item_event'])
-            && in_array($_REQUEST['item_event'], $event_manipulations)
+        if (! empty($_POST['item_event'])
+            && in_array($_POST['item_event'], $event_manipulations)
         ) {
-            $query .= $_REQUEST['item_event'] . ' ';
+            $query .= $_POST['item_event'] . ' ';
         } else {
             $errors[] = __('You must provide a valid event for the trigger!');
         }
         $query .= 'ON ';
-        if (! empty($_REQUEST['item_table'])
-            && in_array($_REQUEST['item_table'], $this->dbi->getTables($db))
+        if (! empty($_POST['item_table'])
+            && in_array($_POST['item_table'], $this->dbi->getTables($db))
         ) {
-            $query .= Util::backquote($_REQUEST['item_table']);
+            $query .= Util::backquote($_POST['item_table']);
         } else {
             $errors[] = __('You must provide a valid table name!');
         }
         $query .= ' FOR EACH ROW ';
-        if (! empty($_REQUEST['item_definition'])) {
-            $query .= $_REQUEST['item_definition'];
+        if (! empty($_POST['item_definition'])) {
+            $query .= $_POST['item_definition'];
         } else {
             $errors[] = __('You must provide a trigger definition.');
         }
diff --git a/libraries/classes/Server/Privileges.php b/libraries/classes/Server/Privileges.php
index 801a8fef0e..ae81b16760 100644
--- a/libraries/classes/Server/Privileges.php
+++ b/libraries/classes/Server/Privileges.php
@@ -78,7 +78,7 @@ class Privileges
     public function getHtmlForUserGroupDialog($username, $is_menuswork)
     {
         $html = '';
-        if (! empty($_REQUEST['edit_user_group_dialog']) && $is_menuswork) {
+        if (! empty($_GET['edit_user_group_dialog']) && $is_menuswork) {
             $dialog = $this->getHtmlToChooseUserGroup($username);
             $response = Response::getInstance();
             if ($response->isAjax()) {
@@ -1949,7 +1949,7 @@ class Privileges
         // similar logic in user_password.php
         $message = null;
 
-        if (empty($_REQUEST['nopass'])
+        if (empty($_POST['nopass'])
             && isset($_POST['pma_pw'])
             && isset($_POST['pma_pw2'])
         ) {
@@ -1966,8 +1966,8 @@ class Privileges
             $serverType = Util::getServerType();
             $serverVersion = $this->dbi->getVersion();
             $authentication_plugin
-                = (isset($_REQUEST['authentication_plugin'])
-                ? $_REQUEST['authentication_plugin']
+                = (isset($_POST['authentication_plugin'])
+                ? $_POST['authentication_plugin']
                 : $this->getCurrentAuthenticationPlugin(
                     'change',
                     $username,
@@ -2234,7 +2234,7 @@ class Privileges
     }
 
     /**
-     * Get HTML for addUsersForm, This function call if isset($_REQUEST['adduser'])
+     * Get HTML for addUsersForm, This function call if isset($_GET['adduser'])
      *
      * @param string $dbname database name
      *
@@ -2915,9 +2915,13 @@ class Privileges
                 break;
         }
 
-        $html .= ' href="server_privileges.php'
-            . Url::getCommon($params)
-            . '">';
+        $html .= ' href="server_privileges.php';
+        if ($linktype == 'revoke') {
+            $html .= '" data-post="' . Url::getCommon($params, '');
+        } else {
+            $html .= Url::getCommon($params);
+        }
+        $html .= '">';
 
         switch ($linktype) {
             case 'edit':
@@ -3045,7 +3049,7 @@ class Privileges
             $extra_data['sql_query'] = Util::getMessage(null, $sql_query);
         }
 
-        if (isset($_REQUEST['change_copy'])) {
+        if (isset($_POST['change_copy'])) {
             /**
              * generate html on the fly for the new user that was just created.
              */
@@ -3057,7 +3061,7 @@ class Privileges
                 . '&amp;#27;' . htmlspecialchars($hostname) . '" />'
                 . '</td>' . "\n"
                 . '<td><label for="checkbox_sel_users_">'
-                . (empty($_REQUEST['username'])
+                . (empty($_POST['username'])
                         ? '<span style="color: #FF0000">' . __('Any') . '</span>'
                         : htmlspecialchars($username) ) . '</label></td>' . "\n"
                 . '<td>' . htmlspecialchars($hostname) . '</td>' . "\n";
@@ -3146,9 +3150,9 @@ class Privileges
             $extra_data['new_privileges'] = $new_privileges;
         }
 
-        if (isset($_REQUEST['validate_username'])) {
+        if (isset($_GET['validate_username'])) {
             $sql_query = "SELECT * FROM `mysql`.`user` WHERE `User` = '"
-                . $_REQUEST['username'] . "';";
+                . $_GET['username'] . "';";
             $res = $this->dbi->query($sql_query);
             $row = $this->dbi->fetchRow($res);
             if (empty($row)) {
@@ -3868,7 +3872,7 @@ class Privileges
 
         return $this->template->render('server/privileges/initials_row', [
             'array_initials' => $array_initials,
-            'initial' => isset($_REQUEST['initial']) ? $_REQUEST['initial'] : null,
+            'initial' => isset($_GET['initial']) ? $_GET['initial'] : null,
         ]);
     }
 
@@ -3936,7 +3940,7 @@ class Privileges
         if (empty($queries)) {
             $message = Message::error(__('No users selected for deleting!'));
         } else {
-            if ($_REQUEST['mode'] == 3) {
+            if ($_POST['mode'] == 3) {
                 $queries[] = '# ' . __('Reloading the privileges') . ' …';
                 $queries[] = 'FLUSH PRIVILEGES;';
             }
@@ -4047,11 +4051,11 @@ class Privileges
         $queries = null;
         $password = null;
 
-        if (isset($_REQUEST['change_copy'])) {
+        if (isset($_POST['change_copy'])) {
             $user_host_condition = ' WHERE `User` = '
-                . "'" . $this->dbi->escapeString($_REQUEST['old_username']) . "'"
+                . "'" . $this->dbi->escapeString($_POST['old_username']) . "'"
                 . ' AND `Host` = '
-                . "'" . $this->dbi->escapeString($_REQUEST['old_hostname']) . "';";
+                . "'" . $this->dbi->escapeString($_POST['old_hostname']) . "';";
             $row = $this->dbi->fetchSingleRow(
                 'SELECT * FROM `mysql`.`user` ' . $user_host_condition
             );
@@ -4060,7 +4064,7 @@ class Privileges
                 $response->addHTML(
                     Message::notice(__('No user found.'))->getDisplay()
                 );
-                unset($_REQUEST['change_copy']);
+                unset($_POST['change_copy']);
             } else {
                 foreach ($row as $key => $value) {
                     $GLOBALS[$key] = $value;
@@ -4117,12 +4121,12 @@ class Privileges
      */
     public function getDataForDeleteUsers($queries)
     {
-        if (isset($_REQUEST['change_copy'])) {
+        if (isset($_POST['change_copy'])) {
             $selected_usr = [
-                $_REQUEST['old_username'] . '&amp;#27;' . $_REQUEST['old_hostname']
+                $_POST['old_username'] . '&amp;#27;' . $_POST['old_hostname']
             ];
         } else {
-            $selected_usr = $_REQUEST['selected_usr'];
+            $selected_usr = $_POST['selected_usr'];
             $queries = [];
         }
 
@@ -4144,7 +4148,7 @@ class Privileges
                 . '\'@\'' . $this->dbi->escapeString($this_host) . '\';';
             $this->relationCleanup->user($this_user);
 
-            if (isset($_REQUEST['drop_users_db'])) {
+            if (isset($_POST['drop_users_db'])) {
                 $queries[] = 'DROP DATABASE IF EXISTS '
                     . Util::backquote($this_user) . ';';
                 $GLOBALS['reload'] = true;
@@ -4161,7 +4165,7 @@ class Privileges
     public function updateMessageForReload()
     {
         $message = null;
-        if (isset($_REQUEST['flush_privileges'])) {
+        if (isset($_GET['flush_privileges'])) {
             $sql_query = 'FLUSH PRIVILEGES;';
             $this->dbi->query($sql_query);
             $message = Message::success(
@@ -4169,7 +4173,7 @@ class Privileges
             );
         }
 
-        if (isset($_REQUEST['validate_username'])) {
+        if (isset($_GET['validate_username'])) {
             $message = Message::success();
         }
 
@@ -4226,7 +4230,7 @@ class Privileges
         $queries_for_display = null;
         $sql_query = null;
 
-        if (!isset($_REQUEST['adduser_submit']) && !isset($_REQUEST['change_copy'])) {
+        if (!isset($_POST['adduser_submit']) && !isset($_POST['change_copy'])) {
             return [
                 $message, $queries, $queries_for_display, $sql_query, $_add_user_error
             ];
@@ -4261,7 +4265,7 @@ class Privileges
         if ($this->dbi->fetchValue($sql) == 1) {
             $message = Message::error(__('The user %s already exists!'));
             $message->addParam('[em]\'' . $username . '\'@\'' . $hostname . '\'[/em]');
-            $_REQUEST['adduser'] = true;
+            $_GET['adduser'] = true;
             $_add_user_error = true;
 
             return [
@@ -4282,7 +4286,7 @@ class Privileges
             (isset($password) ? $password : '')
         );
 
-        if (empty($_REQUEST['change_copy'])) {
+        if (empty($_POST['change_copy'])) {
             $_error = false;
 
             if (! is_null($create_user_real)) {
@@ -4290,10 +4294,10 @@ class Privileges
                     $_error = true;
                 }
                 if (isset($password_set_real) && !empty($password_set_real)
-                    && isset($_REQUEST['authentication_plugin'])
+                    && isset($_POST['authentication_plugin'])
                 ) {
                     $this->setProperPasswordHashing(
-                        $_REQUEST['authentication_plugin']
+                        $_POST['authentication_plugin']
                     );
                     if ($this->dbi->tryQuery($password_set_real)) {
                         $sql_query .= $password_set_show;
@@ -4310,8 +4314,8 @@ class Privileges
                 $hostname,
                 $dbname
             );
-            if (!empty($_REQUEST['userGroup']) && $is_menuwork) {
-                $this->setUserGroup($GLOBALS['username'], $_REQUEST['userGroup']);
+            if (!empty($_POST['userGroup']) && $is_menuwork) {
+                $this->setUserGroup($GLOBALS['username'], $_POST['userGroup']);
             }
 
             return [
@@ -4325,8 +4329,8 @@ class Privileges
 
         // Copy the user group while copying a user
         $old_usergroup =
-            isset($_REQUEST['old_usergroup']) ? $_REQUEST['old_usergroup'] : null;
-        $this->setUserGroup($_REQUEST['username'], $old_usergroup);
+            isset($_POST['old_usergroup']) ? $_POST['old_usergroup'] : null;
+        $this->setUserGroup($_POST['username'], $old_usergroup);
 
         if (is_null($create_user_real)) {
             $queries[] = $create_user_real;
@@ -4334,10 +4338,10 @@ class Privileges
         $queries[] = $real_sql_query;
 
         if (isset($password_set_real) && ! empty($password_set_real)
-            && isset($_REQUEST['authentication_plugin'])
+            && isset($_POST['authentication_plugin'])
         ) {
             $this->setProperPasswordHashing(
-                $_REQUEST['authentication_plugin']
+                $_POST['authentication_plugin']
             );
 
             $queries[] = $password_set_real;
@@ -4406,25 +4410,25 @@ class Privileges
         /**
          * Checks if a dropdown box has been used for selecting a database / table
          */
-        if (Core::isValid($_REQUEST['pred_tablename'])) {
-            $tablename = $_REQUEST['pred_tablename'];
+        if (Core::isValid($_POST['pred_tablename'])) {
+            $tablename = $_POST['pred_tablename'];
         } elseif (Core::isValid($_REQUEST['tablename'])) {
             $tablename = $_REQUEST['tablename'];
         } else {
             unset($tablename);
         }
 
-        if (Core::isValid($_REQUEST['pred_routinename'])) {
-            $routinename = $_REQUEST['pred_routinename'];
+        if (Core::isValid($_POST['pred_routinename'])) {
+            $routinename = $_POST['pred_routinename'];
         } elseif (Core::isValid($_REQUEST['routinename'])) {
             $routinename = $_REQUEST['routinename'];
         } else {
             unset($routinename);
         }
 
-        if (isset($_REQUEST['pred_dbname'])) {
+        if (isset($_POST['pred_dbname'])) {
             $is_valid_pred_dbname = true;
-            foreach ($_REQUEST['pred_dbname'] as $key => $db_name) {
+            foreach ($_POST['pred_dbname'] as $key => $db_name) {
                 if (! Core::isValid($db_name)) {
                     $is_valid_pred_dbname = false;
                     break;
@@ -4449,7 +4453,7 @@ class Privileges
         }
 
         if (isset($is_valid_pred_dbname) && $is_valid_pred_dbname) {
-            $dbname = $_REQUEST['pred_dbname'];
+            $dbname = $_POST['pred_dbname'];
             // If dbname contains only one database.
             if (count($dbname) == 1) {
                 $dbname = $dbname[0];
@@ -4518,14 +4522,14 @@ class Privileges
     {
         $export = '<textarea class="export" cols="60" rows="15">';
 
-        if (isset($_REQUEST['selected_usr'])) {
+        if (isset($_POST['selected_usr'])) {
             // export privileges for selected users
             $title = __('Privileges');
 
             //For removing duplicate entries of users
-            $_REQUEST['selected_usr'] = array_unique($_REQUEST['selected_usr']);
+            $_POST['selected_usr'] = array_unique($_POST['selected_usr']);
 
-            foreach ($_REQUEST['selected_usr'] as $export_user) {
+            foreach ($_POST['selected_usr'] as $export_user) {
                 $export_username = mb_substr(
                     $export_user,
                     0,
@@ -4727,8 +4731,8 @@ class Privileges
             " IF(`" . $password_column . "` = _latin1 '', 'N', 'Y') AS 'Password'" .
             ' FROM `mysql`.`user`';
 
-        $sql_query .= (isset($_REQUEST['initial'])
-            ? $this->rangeOfUsers($_REQUEST['initial'])
+        $sql_query .= (isset($_GET['initial'])
+            ? $this->rangeOfUsers($_GET['initial'])
             : '');
 
         $sql_query .= ' ORDER BY `User` ASC, `Host` ASC;';
@@ -4808,8 +4812,8 @@ class Privileges
             * Display the user overview
             * (if less than 50 users, display them immediately)
             */
-            if (isset($_REQUEST['initial'])
-                || isset($_REQUEST['showall'])
+            if (isset($_GET['initial'])
+                || isset($_GET['showall'])
                 || $this->dbi->numRows($res) < 50
             ) {
                 $html_output .= $this->getUsersOverview(
@@ -5015,9 +5019,9 @@ class Privileges
                 'SELECT `Column_name`, `Column_priv`'
                 . ' FROM `mysql`.`columns_priv`'
                 . ' WHERE `User`'
-                . ' = \'' . $this->dbi->escapeString($_REQUEST['old_username']) . "'"
+                . ' = \'' . $this->dbi->escapeString($_POST['old_username']) . "'"
                 . ' AND `Host`'
-                . ' = \'' . $this->dbi->escapeString($_REQUEST['old_username']) . '\''
+                . ' = \'' . $this->dbi->escapeString($_POST['old_username']) . '\''
                 . ' AND `Db`'
                 . ' = \'' . $this->dbi->escapeString($row['Db']) . "'"
                 . ' AND `Table_name`'
@@ -5093,9 +5097,9 @@ class Privileges
         $hostname
     ) {
         $user_host_condition = ' WHERE `User`'
-            . ' = \'' . $this->dbi->escapeString($_REQUEST['old_username']) . "'"
+            . ' = \'' . $this->dbi->escapeString($_POST['old_username']) . "'"
             . ' AND `Host`'
-            . ' = \'' . $this->dbi->escapeString($_REQUEST['old_hostname']) . '\';';
+            . ' = \'' . $this->dbi->escapeString($_POST['old_hostname']) . '\';';
 
         $res = $this->dbi->query(
             'SELECT * FROM `mysql`.`db`' . $user_host_condition
@@ -5144,14 +5148,14 @@ class Privileges
         if ($_error || (!empty($real_sql_query)
             && !$this->dbi->tryQuery($real_sql_query))
         ) {
-            $_REQUEST['createdb-1'] = $_REQUEST['createdb-2']
-                = $_REQUEST['createdb-3'] = null;
+            $_POST['createdb-1'] = $_POST['createdb-2']
+                = $_POST['createdb-3'] = null;
             $message = Message::rawError($this->dbi->getError());
         } else {
             $message = Message::success(__('You have added a new user.'));
         }
 
-        if (isset($_REQUEST['createdb-1'])) {
+        if (isset($_POST['createdb-1'])) {
             // Create database with same name and grant all privileges
             $q = 'CREATE DATABASE IF NOT EXISTS '
                 . Util::backquote(
@@ -5182,7 +5186,7 @@ class Privileges
             }
         }
 
-        if (isset($_REQUEST['createdb-2'])) {
+        if (isset($_POST['createdb-2'])) {
             // Grant all privileges on wildcard name (username\_%)
             $q = 'GRANT ALL PRIVILEGES ON '
                 . Util::backquote(
@@ -5198,7 +5202,7 @@ class Privileges
             }
         }
 
-        if (isset($_REQUEST['createdb-3'])) {
+        if (isset($_POST['createdb-3'])) {
             // Grant all privileges on the specified database to the new user
             $q = 'GRANT ALL PRIVILEGES ON '
             . Util::backquote(
@@ -5296,21 +5300,21 @@ class Privileges
         // is supported by MySQL 5.5.7+
         if (($serverType == 'MySQL' || $serverType == 'Percona Server')
             && $serverVersion >= 50507
-            && isset($_REQUEST['authentication_plugin'])
+            && isset($_POST['authentication_plugin'])
         ) {
             $create_user_stmt .= ' IDENTIFIED WITH '
-                . $_REQUEST['authentication_plugin'];
+                . $_POST['authentication_plugin'];
         }
 
         // 'IDENTIFIED VIA auth_plugin'
         // is supported by MariaDB 5.2+
         if ($serverType == 'MariaDB'
             && $serverVersion >= 50200
-            && isset($_REQUEST['authentication_plugin'])
+            && isset($_POST['authentication_plugin'])
             && ! $isMariaDBPwdPluginActive
         ) {
             $create_user_stmt .= ' IDENTIFIED VIA '
-                . $_REQUEST['authentication_plugin'];
+                . $_POST['authentication_plugin'];
         }
 
         $create_user_real = $create_user_stmt;
@@ -5333,9 +5337,9 @@ class Privileges
         $real_sql_query = $sql_query = $sql_query_stmt;
 
         // Set the proper hashing method
-        if (isset($_REQUEST['authentication_plugin'])) {
+        if (isset($_POST['authentication_plugin'])) {
             $this->setProperPasswordHashing(
-                $_REQUEST['authentication_plugin']
+                $_POST['authentication_plugin']
             );
         }
 
diff --git a/libraries/classes/Server/Status/Data.php b/libraries/classes/Server/Status/Data.php
index 39b20bc97f..5108052c1e 100644
--- a/libraries/classes/Server/Status/Data.php
+++ b/libraries/classes/Server/Status/Data.php
@@ -145,43 +145,44 @@ class Data
         $links = [];
         // variable or section name => (name => url)
 
-        $links['table'][__('Flush (close) all tables')] = $this->selfUrl
-            . Url::getCommon(
-                [
-                    'flush' => 'TABLES'
-                ]
-            );
-        $links['table'][__('Show open tables')]
-            = 'sql.php' . Url::getCommon(
-                [
-                    'sql_query' => 'SHOW OPEN TABLES',
-                    'goto' => $this->selfUrl,
-                ]
-            );
+        $links['table'][__('Flush (close) all tables')] = [
+            'url' => $this->selfUrl,
+            'params' => Url::getCommon(['flush' => 'TABLES'], ''),
+        ];
+        $links['table'][__('Show open tables')] = [
+            'url' => 'sql.php',
+            'params' => Url::getCommon([
+                'sql_query' => 'SHOW OPEN TABLES',
+                'goto' => $this->selfUrl,
+            ], ''),
+        ];
 
         if ($GLOBALS['replication_info']['master']['status']) {
-            $links['repl'][__('Show slave hosts')]
-                = 'sql.php' . Url::getCommon(
-                    [
-                        'sql_query' => 'SHOW SLAVE HOSTS',
-                        'goto' => $this->selfUrl,
-                    ]
-                );
-            $links['repl'][__('Show master status')] = '#replication_master';
+            $links['repl'][__('Show slave hosts')] = [
+                'url' => 'sql.php',
+                'params' => Url::getCommon([
+                    'sql_query' => 'SHOW SLAVE HOSTS',
+                    'goto' => $this->selfUrl,
+                ], ''),
+            ];
+            $links['repl'][__('Show master status')] = [
+                'url' => '#replication_master',
+                'params' => '',
+            ];
         }
         if ($GLOBALS['replication_info']['slave']['status']) {
-            $links['repl'][__('Show slave status')] = '#replication_slave';
+            $links['repl'][__('Show slave status')] = [
+                'url' => '#replication_slave',
+                'params' => '',
+            ];
         }
 
         $links['repl']['doc'] = 'replication';
 
-        $links['qcache'][__('Flush query cache')]
-            = $this->selfUrl
-            . Url::getCommon(
-                [
-                    'flush' => 'QUERY CACHE'
-                ]
-            );
+        $links['qcache'][__('Flush query cache')] = [
+            'url' => $this->selfUrl,
+            'params' => Url::getCommon(['flush' => 'QUERY CACHE'], ''),
+        ];
         $links['qcache']['doc'] = 'query_cache';
 
         $links['threads']['doc'] = 'mysql_threads';
@@ -192,16 +193,17 @@ class Data
 
         $links['Slow_queries']['doc'] = 'slow_query_log';
 
-        $links['innodb'][__('Variables')]
-            = 'server_engines.php?' . Url::getCommon(['engine' => 'InnoDB']);
-        $links['innodb'][__('InnoDB Status')]
-            = 'server_engines.php'
-            . Url::getCommon(
-                [
-                    'engine' => 'InnoDB',
-                    'page' => 'Status'
-                ]
-            );
+        $links['innodb'][__('Variables')] = [
+            'url' => 'server_engines.php',
+            'params' => Url::getCommon(['engine' => 'InnoDB'], ''),
+        ];
+        $links['innodb'][__('InnoDB Status')] = [
+            'url' => 'server_engines.php',
+            'params' => Url::getCommon([
+                'engine' => 'InnoDB',
+                'page' => 'Status',
+            ], ''),
+        ];
         $links['innodb']['doc'] = 'innodb';
 
         return($links);
diff --git a/libraries/classes/Server/Status/Monitor.php b/libraries/classes/Server/Status/Monitor.php
index 738928c0fa..213d61a4f1 100644
--- a/libraries/classes/Server/Status/Monitor.php
+++ b/libraries/classes/Server/Status/Monitor.php
@@ -381,7 +381,7 @@ class Monitor
      */
     public function getJsonForChartingData()
     {
-        $ret = json_decode($_REQUEST['requiredData'], true);
+        $ret = json_decode($_POST['requiredData'], true);
         $statusVars = [];
         $serverVars = [];
         $sysinfo = $cpuload = $memory = 0;
@@ -658,7 +658,7 @@ class Monitor
     public function getJsonForLogDataTypeGeneral($start, $end)
     {
         $limitTypes = '';
-        if (isset($_REQUEST['limitTypes']) && $_REQUEST['limitTypes']) {
+        if (isset($_POST['limitTypes']) && $_POST['limitTypes']) {
             $limitTypes
                 = 'AND argument REGEXP \'^(INSERT|SELECT|UPDATE|DELETE)\' ';
         }
@@ -677,8 +677,8 @@ class Monitor
         $insertTables = [];
         $insertTablesFirst = -1;
         $i = 0;
-        $removeVars = isset($_REQUEST['removeVariables'])
-            && $_REQUEST['removeVariables'];
+        $removeVars = isset($_POST['removeVariables'])
+            && $_POST['removeVariables'];
 
         while ($row = $GLOBALS['dbi']->fetchAssoc($result)) {
             preg_match('/^(\w+)\s/', $row['argument'], $match);
@@ -779,15 +779,15 @@ class Monitor
      */
     public function getJsonForLoggingVars()
     {
-        if (isset($_REQUEST['varName']) && isset($_REQUEST['varValue'])) {
-            $value = $GLOBALS['dbi']->escapeString($_REQUEST['varValue']);
+        if (isset($_POST['varName']) && isset($_POST['varValue'])) {
+            $value = $GLOBALS['dbi']->escapeString($_POST['varValue']);
             if (! is_numeric($value)) {
                 $value = "'" . $value . "'";
             }
 
-            if (! preg_match("/[^a-zA-Z0-9_]+/", $_REQUEST['varName'])) {
+            if (! preg_match("/[^a-zA-Z0-9_]+/", $_POST['varName'])) {
                 $GLOBALS['dbi']->query(
-                    'SET GLOBAL ' . $_REQUEST['varName'] . ' = ' . $value
+                    'SET GLOBAL ' . $_POST['varName'] . ' = ' . $value
                 );
             }
         }
@@ -810,8 +810,8 @@ class Monitor
     {
         $return = [];
 
-        if (strlen($_REQUEST['database']) > 0) {
-            $GLOBALS['dbi']->selectDb($_REQUEST['database']);
+        if (strlen($_POST['database']) > 0) {
+            $GLOBALS['dbi']->selectDb($_POST['database']);
         }
 
         if ($profiling = Util::profilingSupported()) {
@@ -822,7 +822,7 @@ class Monitor
         $query = preg_replace(
             '/^(\s*SELECT)/i',
             '\\1 SQL_NO_CACHE',
-            $_REQUEST['query']
+            $_POST['query']
         );
 
         $GLOBALS['dbi']->tryQuery($query);
diff --git a/libraries/classes/Server/Status/Processes.php b/libraries/classes/Server/Status/Processes.php
index f4c06f814f..b3d8293d4e 100644
--- a/libraries/classes/Server/Status/Processes.php
+++ b/libraries/classes/Server/Status/Processes.php
@@ -60,7 +60,7 @@ class Processes
     {
         $url_params = [];
 
-        $show_full_sql = ! empty($_REQUEST['full']);
+        $show_full_sql = ! empty($_POST['full']);
         if ($show_full_sql) {
             $url_params['full'] = 1;
             $full_text_link = 'server_status_processes.php' . Url::getCommon(
@@ -118,19 +118,19 @@ class Processes
         $sql_query = $show_full_sql
             ? 'SHOW FULL PROCESSLIST'
             : 'SHOW PROCESSLIST';
-        if ((! empty($_REQUEST['order_by_field'])
-            && ! empty($_REQUEST['sort_order']))
-            || (! empty($_REQUEST['showExecuting']))
+        if ((! empty($_POST['order_by_field'])
+            && ! empty($_POST['sort_order']))
+            || (! empty($_POST['showExecuting']))
         ) {
             $sql_query = 'SELECT * FROM `INFORMATION_SCHEMA`.`PROCESSLIST` ';
         }
-        if (! empty($_REQUEST['showExecuting'])) {
+        if (! empty($_POST['showExecuting'])) {
             $sql_query .= ' WHERE state != "" ';
         }
-        if (!empty($_REQUEST['order_by_field']) && !empty($_REQUEST['sort_order'])) {
+        if (!empty($_POST['order_by_field']) && !empty($_POST['sort_order'])) {
             $sql_query .= ' ORDER BY '
-                . Util::backquote($_REQUEST['order_by_field'])
-                . ' ' . $_REQUEST['sort_order'];
+                . Util::backquote($_POST['order_by_field'])
+                . ' ' . $_POST['sort_order'];
         }
 
         $result = $GLOBALS['dbi']->query($sql_query);
@@ -142,15 +142,15 @@ class Processes
         $retval .= '<tr>';
         $retval .= '<th>' . __('Processes') . '</th>';
         foreach ($sortable_columns as $column) {
-            $is_sorted = ! empty($_REQUEST['order_by_field'])
-                && ! empty($_REQUEST['sort_order'])
-                && ($_REQUEST['order_by_field'] == $column['order_by_field']);
+            $is_sorted = ! empty($_POST['order_by_field'])
+                && ! empty($_POST['sort_order'])
+                && ($_POST['order_by_field'] == $column['order_by_field']);
 
             $column['sort_order'] = 'ASC';
-            if ($is_sorted && $_REQUEST['sort_order'] === 'ASC') {
+            if ($is_sorted && $_POST['sort_order'] === 'ASC') {
                 $column['sort_order'] = 'DESC';
             }
-            if (isset($_REQUEST['showExecuting'])) {
+            if (isset($_POST['showExecuting'])) {
                 $column['showExecuting'] = 'on';
             }
 
@@ -163,7 +163,7 @@ class Processes
             if ($is_sorted) {
                 $asc_display_style = 'inline';
                 $desc_display_style = 'none';
-                if ($_REQUEST['sort_order'] === 'DESC') {
+                if ($_POST['sort_order'] === 'DESC') {
                     $desc_display_style = 'inline';
                     $asc_display_style = 'none';
                 }
@@ -216,23 +216,23 @@ class Processes
     public static function getHtmlForProcessListFilter()
     {
         $showExecuting = '';
-        if (! empty($_REQUEST['showExecuting'])) {
+        if (! empty($_POST['showExecuting'])) {
             $showExecuting = ' checked="checked"';
         }
 
         $url_params = [
             'ajax_request' => true,
-            'full' => (isset($_REQUEST['full']) ? $_REQUEST['full'] : ''),
-            'column_name' => (isset($_REQUEST['column_name']) ? $_REQUEST['column_name'] : ''),
+            'full' => (isset($_POST['full']) ? $_POST['full'] : ''),
+            'column_name' => (isset($_POST['column_name']) ? $_POST['column_name'] : ''),
             'order_by_field'
-                => (isset($_REQUEST['order_by_field']) ? $_REQUEST['order_by_field'] : ''),
-            'sort_order' => (isset($_REQUEST['sort_order']) ? $_REQUEST['sort_order'] : ''),
+                => (isset($_POST['order_by_field']) ? $_POST['order_by_field'] : ''),
+            'sort_order' => (isset($_POST['sort_order']) ? $_POST['sort_order'] : ''),
         ];
 
         $retval  = '';
         $retval .= '<fieldset id="tableFilter">';
         $retval .= '<legend>' . __('Filters') . '</legend>';
-        $retval .= '<form action="server_status_processes.php">';
+        $retval .= '<form action="server_status_processes.php" method="post">';
         $retval .= Url::getHiddenInputs($url_params);
         $retval .= '<input type="submit" value="' . __('Refresh') . '" />';
         $retval .= '<div class="formelement">';
@@ -260,8 +260,8 @@ class Processes
     {
         // Array keys need to modify due to the way it has used
         // to display column values
-        if ((! empty($_REQUEST['order_by_field']) && ! empty($_REQUEST['sort_order']))
-            || (! empty($_REQUEST['showExecuting']))
+        if ((! empty($_POST['order_by_field']) && ! empty($_POST['sort_order']))
+            || (! empty($_POST['showExecuting']))
         ) {
             foreach (array_keys($process) as $key) {
                 $new_key = ucfirst(mb_strtolower($key));
@@ -272,14 +272,9 @@ class Processes
             }
         }
 
-        $url_params = [
-            'kill' => $process['Id'],
-            'ajax_request' => true
-        ];
-        $kill_process = 'server_status_processes.php' . Url::getCommon($url_params);
-
         $retval  = '<tr>';
-        $retval .= '<td><a class="ajax kill_process" href="' . $kill_process . '">'
+        $retval .= '<td><a class="ajax kill_process" href="server_status_processes.php"'
+            . ' data-post="' . Url::getCommon(['kill' => $process['Id']], '') . '">'
             . __('Kill') . '</a></td>';
         $retval .= '<td class="value">' . $process['Id'] . '</td>';
         $retval .= '<td>' . htmlspecialchars($process['User']) . '</td>';
diff --git a/libraries/classes/Server/Status/Variables.php b/libraries/classes/Server/Status/Variables.php
index bc509438e8..32f98ff4df 100644
--- a/libraries/classes/Server/Status/Variables.php
+++ b/libraries/classes/Server/Status/Variables.php
@@ -32,23 +32,23 @@ class Variables
     public static function getHtmlForFilter(Data $serverStatusData)
     {
         $filterAlert = '';
-        if (! empty($_REQUEST['filterAlert'])) {
+        if (! empty($_POST['filterAlert'])) {
             $filterAlert = ' checked="checked"';
         }
         $filterText = '';
-        if (! empty($_REQUEST['filterText'])) {
-            $filterText = htmlspecialchars($_REQUEST['filterText']);
+        if (! empty($_POST['filterText'])) {
+            $filterText = htmlspecialchars($_POST['filterText']);
         }
         $dontFormat = '';
-        if (! empty($_REQUEST['dontFormat'])) {
+        if (! empty($_POST['dontFormat'])) {
             $dontFormat = ' checked="checked"';
         }
 
         $retval  = '';
         $retval .= '<fieldset id="tableFilter">';
         $retval .= '<legend>' . __('Filters') . '</legend>';
-        $retval .= '<form action="server_status_variables.php'
-            . Url::getCommon() . '">';
+        $retval .= '<form action="server_status_variables.php" method="post">';
+        $retval .= Url::getHiddenInputs();
         $retval .= '<input type="submit" value="' . __('Refresh') . '" />';
         $retval .= '<div class="formelement">';
         $retval .= '<label for="filterText">' . __('Containing the word:') . '</label>';
@@ -68,8 +68,8 @@ class Variables
 
         foreach ($serverStatusData->sections as $section_id => $section_name) {
             if (isset($serverStatusData->sectionUsed[$section_id])) {
-                if (! empty($_REQUEST['filterCategory'])
-                    && $_REQUEST['filterCategory'] == $section_id
+                if (! empty($_POST['filterCategory'])
+                    && $_POST['filterCategory'] == $section_id
                 ) {
                     $selected = ' selected="selected"';
                 } else {
@@ -115,7 +115,8 @@ class Variables
                 if ('doc' == $link_name) {
                     $retval .= Util::showMySQLDocu($link_url);
                 } else {
-                    $retval .= '<a href="' . $link_url . '">' . $link_name . '</a>';
+                    $retval .= '<a href="' . $link_url['url'] . '" data-post="' . $link_url['params'] . '">'
+                        . $link_name . '</a>';
                 }
                 $i++;
             }
@@ -307,7 +308,8 @@ class Variables
                     if ('doc' == $link_name) {
                         $retval .= Util::showMySQLDocu($link_url);
                     } else {
-                        $retval .= ' <a href="' . $link_url . '">' . $link_name . '</a>';
+                        $retval .= ' <a href="' . $link_url['url'] . '" data-post="' . $link_url['params'] . '">'
+                            . $link_name . '</a>';
                     }
                 }
                 unset($link_url, $link_name);
diff --git a/libraries/classes/Server/UserGroups.php b/libraries/classes/Server/UserGroups.php
index 34a6c71907..91071fb22c 100644
--- a/libraries/classes/Server/UserGroups.php
+++ b/libraries/classes/Server/UserGroups.php
@@ -112,31 +112,34 @@ class UserGroups
                 $html_output .= '<td>' . self::getAllowedTabNames($tabs, 'table') . '</td>';
 
                 $html_output .= '<td>';
-                $html_output .= '<a class="" href="server_user_groups.php'
+                $html_output .= '<a class="" href="server_user_groups.php" data-post="'
                     . Url::getCommon(
                         [
                             'viewUsers' => 1, 'userGroup' => $groupName
-                        ]
+                        ],
+                        ''
                     )
                     . '">'
                     . Util::getIcon('b_usrlist', __('View users'))
                     . '</a>';
                 $html_output .= '&nbsp;&nbsp;';
-                $html_output .= '<a class="" href="server_user_groups.php'
+                $html_output .= '<a class="" href="server_user_groups.php" data-post="'
                     . Url::getCommon(
                         [
                             'editUserGroup' => 1, 'userGroup' => $groupName
-                        ]
+                        ],
+                        ''
                     )
                     . '">'
                     . Util::getIcon('b_edit', __('Edit')) . '</a>';
                 $html_output .= '&nbsp;&nbsp;';
                 $html_output .= '<a class="deleteUserGroup ajax"'
-                    . ' href="server_user_groups.php'
+                    . ' href="server_user_groups.php" data-post="'
                     . Url::getCommon(
                         [
                             'deleteUserGroup' => 1, 'userGroup' => $groupName
-                        ]
+                        ],
+                        ''
                     )
                     . '">'
                     . Util::getIcon('b_drop', __('Delete')) . '</a>';
@@ -372,7 +375,7 @@ class UserGroups
                     $sql_query .= ", ";
                 }
                 $tabName = $tabGroupName . '_' . $tab;
-                $allowed = isset($_REQUEST[$tabName]) && $_REQUEST[$tabName] == 'Y';
+                $allowed = isset($_POST[$tabName]) && $_POST[$tabName] == 'Y';
                 $sql_query .= "('" . $GLOBALS['dbi']->escapeString($userGroup) . "', '" . $tabName . "', '"
                     . ($allowed ? "Y" : "N") . "')";
                 $first = false;
diff --git a/libraries/classes/Sql.php b/libraries/classes/Sql.php
index 435183da97..7ac6c3a077 100644
--- a/libraries/classes/Sql.php
+++ b/libraries/classes/Sql.php
@@ -241,10 +241,10 @@ class Sql
             ];
 
             $dropdown = '<span class="curr_value">'
-                . htmlspecialchars($_REQUEST['curr_value'])
+                . htmlspecialchars($_POST['curr_value'])
                 . '</span>'
-                . '<a href="browse_foreigners.php'
-                . Url::getCommon($_url_params) . '"'
+                . '<a href="browse_foreigners.php" data-post="'
+                . Url::getCommon($_url_params, '') . '"'
                 . 'class="ajax browse_foreign" ' . '>'
                 . __('Browse foreign values')
                 . '</a>';
@@ -496,9 +496,9 @@ EOT;
         $values = $this->getValuesForColumn($db, $table, $column);
         $dropdown = '';
         $full_values =
-            isset($_REQUEST['get_full_values']) ? $_REQUEST['get_full_values'] : false;
+            isset($_POST['get_full_values']) ? $_POST['get_full_values'] : false;
         $where_clause =
-            isset($_REQUEST['where_clause']) ? $_REQUEST['where_clause'] : null;
+            isset($_POST['where_clause']) ? $_POST['where_clause'] : null;
 
         // If the $curr_value was truncated, we should
         // fetch the correct full values from the table
@@ -783,7 +783,7 @@ EOT;
      */
     private function setColumnProperty($pmatable, $request_index)
     {
-        $property_value = array_map('intval', explode(',', $_REQUEST[$request_index]));
+        $property_value = array_map('intval', explode(',', $_POST[$request_index]));
         switch ($request_index) {
             case 'col_order':
                 $property_to_set = Table::PROP_COLUMN_ORDER;
@@ -797,7 +797,7 @@ EOT;
         $retval = $pmatable->setUiProp(
             $property_to_set,
             $property_value,
-            $_REQUEST['table_create_time']
+            $_POST['table_create_time']
         );
         if (gettype($retval) != 'boolean') {
             $response = Response::getInstance();
@@ -823,12 +823,12 @@ EOT;
         $retval = false;
 
         // set column order
-        if (isset($_REQUEST['col_order'])) {
+        if (isset($_POST['col_order'])) {
             $retval = $this->setColumnProperty($pmatable, 'col_order');
         }
 
         // set column visibility
-        if ($retval === true && isset($_REQUEST['col_visib'])) {
+        if ($retval === true && isset($_POST['col_visib'])) {
             $retval = $this->setColumnProperty($pmatable, 'col_visib');
         }
 
@@ -905,14 +905,14 @@ EOT;
      */
     public function getRelationalValues($db, $table)
     {
-        $column = $_REQUEST['column'];
+        $column = $_POST['column'];
         if ($_SESSION['tmpval']['relational_display'] == 'D'
-            && isset($_REQUEST['relation_key_or_display_column'])
-            && $_REQUEST['relation_key_or_display_column']
+            && isset($_POST['relation_key_or_display_column'])
+            && $_POST['relation_key_or_display_column']
         ) {
-            $curr_value = $_REQUEST['relation_key_or_display_column'];
+            $curr_value = $_POST['relation_key_or_display_column'];
         } else {
-            $curr_value = $_REQUEST['curr_value'];
+            $curr_value = $_POST['curr_value'];
         }
         $dropdown = $this->getHtmlForRelationalColumnDropdown(
             $db,
@@ -936,8 +936,8 @@ EOT;
      */
     public function getEnumOrSetValues($db, $table, $columnType)
     {
-        $column = $_REQUEST['column'];
-        $curr_value = $_REQUEST['curr_value'];
+        $column = $_POST['column'];
+        $curr_value = $_POST['curr_value'];
         $response = Response::getInstance();
         if ($columnType == "enum") {
             $dropdown = $this->getHtmlForEnumColumnDropdown(
@@ -1374,11 +1374,11 @@ EOT;
             $this->cleanupRelations(
                 isset($db) ? $db : '',
                 isset($table) ? $table : '',
-                isset($_REQUEST['dropped_column']) ? $_REQUEST['dropped_column'] : null,
-                isset($_REQUEST['purge']) ? $_REQUEST['purge'] : null
+                isset($_POST['dropped_column']) ? $_POST['dropped_column'] : null,
+                isset($_POST['purge']) ? $_POST['purge'] : null
             );
 
-            if (isset($_REQUEST['dropped_column'])
+            if (isset($_POST['dropped_column'])
                 && strlen($db) > 0
                 && strlen($table) > 0
             ) {
@@ -1496,7 +1496,7 @@ EOT;
         }
 
         // In case of ROLLBACK, notify the user.
-        if (isset($_REQUEST['rollback_query'])) {
+        if (isset($_POST['rollback_query'])) {
             $message->addText(__('[ROLLBACK occurred.]'));
         }
 
@@ -1740,9 +1740,9 @@ EOT;
         array $analyzed_sql_results,
         $is_limited_display = false
     ) {
-        $printview = isset($_REQUEST['printview']) && $_REQUEST['printview'] == '1' ? '1' : null;
+        $printview = isset($_POST['printview']) && $_POST['printview'] == '1' ? '1' : null;
         $table_html = '';
-        $browse_dist = ! empty($_REQUEST['is_browse_distinct']);
+        $browse_dist = ! empty($_POST['is_browse_distinct']);
 
         if ($analyzed_sql_results['is_procedure']) {
             do {
@@ -2009,7 +2009,7 @@ EOT;
         global $showtable, $url_query;
         // If we are retrieving the full value of a truncated field or the original
         // value of a transformed field, show it here
-        if (isset($_REQUEST['grid_edit']) && $_REQUEST['grid_edit'] == true) {
+        if (isset($_POST['grid_edit']) && $_POST['grid_edit'] == true) {
             $this->sendResponseForGridEdit($result);
             // script has exited at this point
         }
@@ -2090,7 +2090,7 @@ EOT;
                 'pview_lnk' => '1'
             ];
         }
-        if (isset($_REQUEST['printview']) && $_REQUEST['printview'] == '1') {
+        if (isset($_POST['printview']) && $_POST['printview'] == '1') {
             $displayParts = [
                 'edit_lnk' => $displayResultsObject::NO_EDIT_OR_DELETE,
                 'del_lnk' => $displayResultsObject::NO_EDIT_OR_DELETE,
@@ -2102,7 +2102,7 @@ EOT;
             ];
         }
 
-        if (isset($_REQUEST['table_maintenance'])) {
+        if (isset($_POST['table_maintenance'])) {
             $scripts->addFile('makegrid.js');
             $scripts->addFile('sql.js');
             $table_maintenance_html = '';
@@ -2132,7 +2132,7 @@ EOT;
             }
         }
 
-        if (!isset($_REQUEST['printview']) || $_REQUEST['printview'] != '1') {
+        if (!isset($_POST['printview']) || $_POST['printview'] != '1') {
             $scripts->addFile('makegrid.js');
             $scripts->addFile('sql.js');
             unset($GLOBALS['message']);
@@ -2357,7 +2357,7 @@ EOT;
         if (! empty($analyzed_sql_results)
             && $this->isRememberSortingOrder($analyzed_sql_results)
             && empty($analyzed_sql_results['union'])
-            && ! isset($_REQUEST['sort_by_key'])
+            && ! isset($_POST['sort_by_key'])
         ) {
             if (! isset($_SESSION['sql_from_query_box'])) {
                 $this->handleSortOrder($db, $table, $analyzed_sql_results, $sql_query);
diff --git a/libraries/classes/Table.php b/libraries/classes/Table.php
index 92335e0f82..189a8ab164 100644
--- a/libraries/classes/Table.php
+++ b/libraries/classes/Table.php
@@ -1063,8 +1063,8 @@ class Table
             // Phase 1: Dropping existent element of the same name (if exists
             // and required).
 
-            if (isset($_REQUEST['drop_if_exists'])
-                && $_REQUEST['drop_if_exists'] == 'true'
+            if (isset($_POST['drop_if_exists'])
+                && $_POST['drop_if_exists'] == 'true'
             ) {
 
                 /**
@@ -1919,7 +1919,7 @@ class Table
                 return false;
             }
 
-            if (!isset($_REQUEST['discard_remembered_sort'])) {
+            if (!isset($_POST['discard_remembered_sort'])) {
                 // check if the column name exists in this table
                 $tmp = explode(' ', $this->uiprefs[$property]);
                 $colname = $tmp[0];
@@ -2125,13 +2125,13 @@ class Table
         );
 
         // Drops the old index
-        if (! empty($_REQUEST['old_index'])) {
-            if ($_REQUEST['old_index'] == 'PRIMARY') {
+        if (! empty($_POST['old_index'])) {
+            if ($_POST['old_index'] == 'PRIMARY') {
                 $sql_query .= ' DROP PRIMARY KEY,';
             } else {
                 $sql_query .= sprintf(
                     ' DROP INDEX %s,',
-                    Util::backquote($_REQUEST['old_index'])
+                    Util::backquote($_POST['old_index'])
                 );
             }
         } // end if
@@ -2428,9 +2428,9 @@ class Table
                         || $existrel_foreign[$master_field_md5]['ref_table_name'] != $foreign_table
                         || $existrel_foreign[$master_field_md5]['ref_index_list'] != $foreign_field
                         || $existrel_foreign[$master_field_md5]['index_list'] != $master_field
-                        || $_REQUEST['constraint_name'][$master_field_md5] != $constraint_name
-                        || ($_REQUEST['on_delete'][$master_field_md5] != $on_delete)
-                        || ($_REQUEST['on_update'][$master_field_md5] != $on_update)
+                        || $_POST['constraint_name'][$master_field_md5] != $constraint_name
+                        || ($_POST['on_delete'][$master_field_md5] != $on_delete)
+                        || ($_POST['on_update'][$master_field_md5] != $on_update)
                     ) {
                         // another foreign key is already defined for this field
                         // or an option has been changed for ON DELETE or ON UPDATE
@@ -2454,7 +2454,7 @@ class Table
                     )
                     . ';';
 
-                if (! isset($_REQUEST['preview_sql'])) {
+                if (! isset($_POST['preview_sql'])) {
                     $display_query .= $drop_query . "\n";
                     $this->_dbi->tryQuery($drop_query);
                     $tmp_error_drop = $this->_dbi->getError();
@@ -2485,12 +2485,12 @@ class Table
                 $foreign_db,
                 $foreign_table,
                 $foreign_field,
-                $_REQUEST['constraint_name'][$master_field_md5],
-                $options_array[$_REQUEST['on_delete'][$master_field_md5]],
-                $options_array[$_REQUEST['on_update'][$master_field_md5]]
+                $_POST['constraint_name'][$master_field_md5],
+                $options_array[$_POST['on_delete'][$master_field_md5]],
+                $options_array[$_POST['on_update'][$master_field_md5]]
             );
 
-            if (! isset($_REQUEST['preview_sql'])) {
+            if (! isset($_POST['preview_sql'])) {
                 $display_query .= $create_query . "\n";
                 $this->_dbi->tryQuery($create_query);
                 $tmp_error_create = $this->_dbi->getError();
@@ -2540,7 +2540,7 @@ class Table
                     $options_array[$existrel_foreign[$master_field_md5]['on_delete']],
                     $options_array[$existrel_foreign[$master_field_md5]['on_update']]
                 );
-                if (! isset($_REQUEST['preview_sql'])) {
+                if (! isset($_POST['preview_sql'])) {
                     $display_query .= $sql_query_recreate . "\n";
                     $this->_dbi->tryQuery($sql_query_recreate);
                 } else {
diff --git a/libraries/classes/Tracking.php b/libraries/classes/Tracking.php
index 90f8e03e86..c42ffaeaf9 100644
--- a/libraries/classes/Tracking.php
+++ b/libraries/classes/Tracking.php
@@ -146,10 +146,10 @@ class Tracking
         $sql_query = " SELECT * FROM " .
             Util::backquote($cfgRelation['db']) . "." .
             Util::backquote($cfgRelation['tracking']) .
-            " WHERE db_name = '" . $GLOBALS['dbi']->escapeString($_REQUEST['db']) .
+            " WHERE db_name = '" . $GLOBALS['dbi']->escapeString($GLOBALS['db']) .
             "' " .
             " AND table_name = '" .
-            $GLOBALS['dbi']->escapeString($_REQUEST['table']) . "' " .
+            $GLOBALS['dbi']->escapeString($GLOBALS['table']) . "' " .
             " ORDER BY version DESC ";
 
         return $relation->queryAsControlUser($sql_query);
@@ -204,7 +204,7 @@ class Tracking
             'table' => $GLOBALS['table'],
             'selectable_tables_num_rows' => $selectableTablesNumRows,
             'selectable_tables_entries' => $selectableTablesEntries,
-            'selected_table' => isset($_REQUEST['table']) ? $_REQUEST['table'] : null,
+            'selected_table' => isset($_POST['table']) ? $_POST['table'] : null,
             'last_version' => $lastVersion,
             'versions' => $versions,
             'type' => $type,
@@ -364,11 +364,11 @@ class Tracking
             . __('Structure and data') . '</option>'
             . '</select>';
         $str2 = '<input type="text" name="date_from" value="'
-            . htmlspecialchars($_REQUEST['date_from']) . '" size="19" />';
+            . htmlspecialchars($_POST['date_from']) . '" size="19" />';
         $str3 = '<input type="text" name="date_to" value="'
-            . htmlspecialchars($_REQUEST['date_to']) . '" size="19" />';
+            . htmlspecialchars($_POST['date_to']) . '" size="19" />';
         $str4 = '<input type="text" name="users" value="'
-            . htmlspecialchars($_REQUEST['users']) . '" />';
+            . htmlspecialchars($_POST['users']) . '" />';
         $str5 = '<input type="hidden" name="list_report" value="1" />'
             . '<input type="submit" value="' . __('Go') . '" />';
         return [$str1, $str2, $str3, $str4, $str5];
@@ -412,14 +412,11 @@ class Tracking
     ) {
         $ddlog_count = 0;
 
-        $html = '<form method="post" action="tbl_tracking.php'
-            . Url::getCommon(
-                $url_params + [
-                    'report' => 'true', 'version' => $_REQUEST['version']
-                ]
-            )
-            . '">';
-        $html .= Url::getHiddenInputs();
+        $html = '<form method="post" action="tbl_tracking.php">';
+        $html .= Url::getHiddenInputs($url_params + [
+            'report' => 'true',
+            'version' => $_POST['version'],
+        ]);
 
         $html .= sprintf(
             __('Show %1$s with dates from %2$s to %3$s by user %4$s %5$s'),
@@ -481,14 +478,12 @@ class Tracking
         $str4,
         $str5
     ) {
-        $html = '<form method="post" action="tbl_tracking.php'
-            . Url::getCommon(
-                $url_params + [
-                    'report' => 'true', 'version' => $_REQUEST['version']
-                ]
-            )
-            . '">';
-        $html .= Url::getHiddenInputs();
+        $html = '<form method="post" action="tbl_tracking.php">';
+        $html .= Url::getHiddenInputs($url_params + [
+            'report' => 'true',
+            'version' => $_POST['version'],
+        ]);
+
         $html .= sprintf(
             __('Show %1$s with dates from %2$s to %3$s by user %4$s %5$s'),
             $str1,
@@ -499,21 +494,16 @@ class Tracking
         );
         $html .= '</form>';
 
-        $html .= '<form class="disableAjax" method="post" action="tbl_tracking.php'
-            . Url::getCommon(
-                $url_params
-                + ['report' => 'true', 'version' => $_REQUEST['version']]
-            )
-            . '">';
-        $html .= Url::getHiddenInputs();
-        $html .= '<input type="hidden" name="logtype" value="'
-            . htmlspecialchars($_REQUEST['logtype']) . '" />';
-        $html .= '<input type="hidden" name="date_from" value="'
-            . htmlspecialchars($_REQUEST['date_from']) . '" />';
-        $html .= '<input type="hidden" name="date_to" value="'
-            . htmlspecialchars($_REQUEST['date_to']) . '" />';
-        $html .= '<input type="hidden" name="users" value="'
-            . htmlspecialchars($_REQUEST['users']) . '" />';
+        $html .= '<form class="disableAjax" method="post" action="tbl_tracking.php">';
+        $html .= Url::getHiddenInputs($url_params + [
+            'report' => 'true',
+            'version' => $_POST['version'],
+            'logtype' => $_POST['logtype'],
+            'date_from' => $_POST['date_from'],
+            'date_to' => $_POST['date_to'],
+            'users' => $_POST['users'],
+            'report_export' => 'true',
+        ]);
 
         $str_export1 = '<select name="export_type">'
             . '<option value="sqldumpfile">' . __('SQL dump (file download)')
@@ -525,8 +515,7 @@ class Tracking
             )
             . '\')">' . __('SQL execution') . '</option>' . '</select>';
 
-        $str_export2 = '<input type="hidden" name="report_export" value="1" />'
-            . '<input type="submit" value="' . __('Go') . '" />';
+        $str_export2 = '<input type="submit" value="' . __('Go') . '" />';
 
         $html .= "<br/>" . sprintf(__('Export as %s'), $str_export1)
             . $str_export2 . "<br/>";
@@ -650,9 +639,9 @@ class Tracking
                 $deleteParam = 'delete_' . $whichLog;
                 $entry['url_params'] = Url::getCommon($urlParams + [
                     'report' => 'true',
-                    'version' => $_REQUEST['version'],
+                    'version' => $_POST['version'],
                     $deleteParam => ($lineNumber - $offset),
-                ]);
+                ], '');
                 $entry['line_number'] = $lineNumber;
                 $entries[] = $entry;
             }
@@ -682,9 +671,9 @@ class Tracking
             . '  [<a href="tbl_tracking.php' . $url_query . '">' . __('Close')
             . '</a>]</h3>';
         $data = Tracker::getTrackedData(
-            $_REQUEST['db'],
-            $_REQUEST['table'],
-            $_REQUEST['version']
+            $_POST['db'],
+            $_POST['table'],
+            $_POST['version']
         );
 
         // Get first DROP TABLE/VIEW and CREATE TABLE/VIEW statements
@@ -699,7 +688,7 @@ class Tracking
         $html .= Util::getMessage(
             sprintf(
                 __('Version %s snapshot (SQL code)'),
-                htmlspecialchars($_REQUEST['version'])
+                htmlspecialchars($_POST['version'])
             ),
             $drop_create_statements
         );
@@ -759,7 +748,7 @@ class Tracking
     public function deleteTrackingReportRows(array &$data)
     {
         $html = '';
-        if (isset($_REQUEST['delete_ddlog'])) {
+        if (isset($_POST['delete_ddlog'])) {
             // Delete ddlog row data
             $html .= $this->deleteFromTrackingReportLog(
                 $data,
@@ -769,7 +758,7 @@ class Tracking
             );
         }
 
-        if (isset($_REQUEST['delete_dmlog'])) {
+        if (isset($_POST['delete_dmlog'])) {
             // Delete dmlog row data
             $html .= $this->deleteFromTrackingReportLog(
                 $data,
@@ -794,16 +783,16 @@ class Tracking
     public function deleteFromTrackingReportLog(array &$data, $which_log, $type, $message)
     {
         $html = '';
-        $delete_id = $_REQUEST['delete_' . $which_log];
+        $delete_id = $_POST['delete_' . $which_log];
 
         // Only in case of valid id
         if ($delete_id == (int)$delete_id) {
             unset($data[$which_log][$delete_id]);
 
             $successfullyDeleted = Tracker::changeTrackingData(
-                $_REQUEST['db'],
-                $_REQUEST['table'],
-                $_REQUEST['version'],
+                $GLOBALS['db'],
+                $GLOBALS['table'],
+                $_POST['version'],
                 $type,
                 $data[$which_log]
             );
@@ -889,7 +878,7 @@ class Tracking
         ini_set('url_rewriter.tags', '');
 
         // Replace all multiple whitespaces by a single space
-        $table = htmlspecialchars(preg_replace('/\s+/', ' ', $_REQUEST['table']));
+        $table = htmlspecialchars(preg_replace('/\s+/', ' ', $_POST['table']));
         $dump = "# " . sprintf(
             __('Tracking report for table `%s`'),
             $table
@@ -930,14 +919,14 @@ class Tracking
         $status = Tracker::$method(
             $GLOBALS['db'],
             $GLOBALS['table'],
-            $_REQUEST['version']
+            $_POST['version']
         );
         if ($status) {
             $msg = Message::success(
                 sprintf(
                     $message,
                     htmlspecialchars($GLOBALS['db'] . '.' . $GLOBALS['table']),
-                    htmlspecialchars($_REQUEST['version'])
+                    htmlspecialchars($_POST['version'])
                 )
             );
             $html .= $msg->getDisplay();
@@ -957,43 +946,43 @@ class Tracking
 
         // a key is absent from the request if it has been removed from
         // tracking_default_statements in the config
-        if (isset($_REQUEST['alter_table']) && $_REQUEST['alter_table'] == true) {
+        if (isset($_POST['alter_table']) && $_POST['alter_table'] == true) {
             $tracking_set .= 'ALTER TABLE,';
         }
-        if (isset($_REQUEST['rename_table']) && $_REQUEST['rename_table'] == true) {
+        if (isset($_POST['rename_table']) && $_POST['rename_table'] == true) {
             $tracking_set .= 'RENAME TABLE,';
         }
-        if (isset($_REQUEST['create_table']) && $_REQUEST['create_table'] == true) {
+        if (isset($_POST['create_table']) && $_POST['create_table'] == true) {
             $tracking_set .= 'CREATE TABLE,';
         }
-        if (isset($_REQUEST['drop_table']) && $_REQUEST['drop_table'] == true) {
+        if (isset($_POST['drop_table']) && $_POST['drop_table'] == true) {
             $tracking_set .= 'DROP TABLE,';
         }
-        if (isset($_REQUEST['alter_view']) && $_REQUEST['alter_view'] == true) {
+        if (isset($_POST['alter_view']) && $_POST['alter_view'] == true) {
             $tracking_set .= 'ALTER VIEW,';
         }
-        if (isset($_REQUEST['create_view']) && $_REQUEST['create_view'] == true) {
+        if (isset($_POST['create_view']) && $_POST['create_view'] == true) {
             $tracking_set .= 'CREATE VIEW,';
         }
-        if (isset($_REQUEST['drop_view']) && $_REQUEST['drop_view'] == true) {
+        if (isset($_POST['drop_view']) && $_POST['drop_view'] == true) {
             $tracking_set .= 'DROP VIEW,';
         }
-        if (isset($_REQUEST['create_index']) && $_REQUEST['create_index'] == true) {
+        if (isset($_POST['create_index']) && $_POST['create_index'] == true) {
             $tracking_set .= 'CREATE INDEX,';
         }
-        if (isset($_REQUEST['drop_index']) && $_REQUEST['drop_index'] == true) {
+        if (isset($_POST['drop_index']) && $_POST['drop_index'] == true) {
             $tracking_set .= 'DROP INDEX,';
         }
-        if (isset($_REQUEST['insert']) && $_REQUEST['insert'] == true) {
+        if (isset($_POST['insert']) && $_POST['insert'] == true) {
             $tracking_set .= 'INSERT,';
         }
-        if (isset($_REQUEST['update']) && $_REQUEST['update'] == true) {
+        if (isset($_POST['update']) && $_POST['update'] == true) {
             $tracking_set .= 'UPDATE,';
         }
-        if (isset($_REQUEST['delete']) && $_REQUEST['delete'] == true) {
+        if (isset($_POST['delete']) && $_POST['delete'] == true) {
             $tracking_set .= 'DELETE,';
         }
-        if (isset($_REQUEST['truncate']) && $_REQUEST['truncate'] == true) {
+        if (isset($_POST['truncate']) && $_POST['truncate'] == true) {
             $tracking_set .= 'TRUNCATE,';
         }
         $tracking_set = rtrim($tracking_set, ',');
@@ -1043,7 +1032,7 @@ class Tracking
         $versionCreated = Tracker::createVersion(
             $GLOBALS['db'],
             $GLOBALS['table'],
-            $_REQUEST['version'],
+            $_POST['version'],
             $tracking_set,
             $GLOBALS['dbi']->getTable($GLOBALS['db'], $GLOBALS['table'])->isView()
         );
@@ -1051,7 +1040,7 @@ class Tracking
             $msg = Message::success(
                 sprintf(
                     __('Version %1$s was created, tracking for %2$s is active.'),
-                    htmlspecialchars($_REQUEST['version']),
+                    htmlspecialchars($_POST['version']),
                     htmlspecialchars($GLOBALS['db'] . '.' . $GLOBALS['table'])
                 )
             );
@@ -1076,7 +1065,7 @@ class Tracking
             Tracker::createVersion(
                 $GLOBALS['db'],
                 $selected_table,
-                $_REQUEST['version'],
+                $_POST['version'],
                 $tracking_set,
                 $GLOBALS['dbi']->getTable($GLOBALS['db'], $selected_table)->isView()
             );
@@ -1097,8 +1086,8 @@ class Tracking
     {
         $entries = [];
         // Filtering data definition statements
-        if ($_REQUEST['logtype'] == 'schema'
-            || $_REQUEST['logtype'] == 'schema_and_data'
+        if ($_POST['logtype'] == 'schema'
+            || $_POST['logtype'] == 'schema_and_data'
         ) {
             $entries = array_merge(
                 $entries,
@@ -1112,8 +1101,8 @@ class Tracking
         }
 
         // Filtering data manipulation statements
-        if ($_REQUEST['logtype'] == 'data'
-            || $_REQUEST['logtype'] == 'schema_and_data'
+        if ($_POST['logtype'] == 'data'
+            || $_POST['logtype'] == 'schema_and_data'
         ) {
             $entries = array_merge(
                 $entries,
@@ -1170,7 +1159,6 @@ class Tracking
      * Get HTML for tracked and untracked tables
      *
      * @param string $db            current database
-     * @param string $requestDb     $_REQUEST['db']
      * @param string $urlQuery      url query string
      * @param string $pmaThemeImage path to theme's image folder
      * @param string $textDir       text direction
@@ -1179,7 +1167,6 @@ class Tracking
      */
     public function getHtmlForDbTrackingTables(
         string $db,
-        string $requestDb,
         string $urlQuery,
         string $pmaThemeImage,
         string $textDir
@@ -1191,7 +1178,7 @@ class Tracking
         $allTablesQuery = ' SELECT table_name, MAX(version) as version FROM ' .
             Util::backquote($cfgRelation['db']) . '.' .
             Util::backquote($cfgRelation['tracking']) .
-            ' WHERE db_name = \'' . $GLOBALS['dbi']->escapeString($requestDb) .
+            ' WHERE db_name = \'' . $GLOBALS['dbi']->escapeString($db) .
             '\' ' .
             ' GROUP BY table_name' .
             ' ORDER BY table_name ASC';
@@ -1210,7 +1197,7 @@ class Tracking
                      Util::backquote($cfgRelation['db']) . '.' .
                      Util::backquote($cfgRelation['tracking']) .
                      ' WHERE `db_name` = \''
-                     . $GLOBALS['dbi']->escapeString($requestDb)
+                     . $GLOBALS['dbi']->escapeString($db)
                      . '\' AND `table_name`  = \''
                      . $GLOBALS['dbi']->escapeString($tableName)
                      . '\' AND `version` = \'' . $versionNumber . '\'';
diff --git a/libraries/classes/Transformations.php b/libraries/classes/Transformations.php
index 8559ac54b4..c5fa9ee55b 100644
--- a/libraries/classes/Transformations.php
+++ b/libraries/classes/Transformations.php
@@ -183,16 +183,17 @@ class Transformations
      *
      * @param string $file transformation file
      *
-     * @return String the description of the transformation
+     * @return string the description of the transformation
      */
     public function getDescription($file)
     {
         $include_file = 'libraries/classes/Plugins/Transformations/' . $file;
-        /* @var $class_name PhpMyAdmin\Plugins\TransformationsInterface */
+        /* @var $class_name \PhpMyAdmin\Plugins\TransformationsInterface */
         $class_name = $this->getClassName($include_file);
-        // include and instantiate the class
-        include_once $include_file;
-        return $class_name::getInfo();
+        if (class_exists($class_name)) {
+            return $class_name::getInfo();
+        }
+        return '';
     }
 
     /**
@@ -200,16 +201,17 @@ class Transformations
      *
      * @param string $file transformation file
      *
-     * @return String the name of the transformation
+     * @return string the name of the transformation
      */
     public function getName($file)
     {
         $include_file = 'libraries/classes/Plugins/Transformations/' . $file;
-        /* @var $class_name PhpMyAdmin\Plugins\TransformationsInterface */
+        /* @var $class_name \PhpMyAdmin\Plugins\TransformationsInterface */
         $class_name = $this->getClassName($include_file);
-        // include and instantiate the class
-        include_once $include_file;
-        return $class_name::getName();
+        if (class_exists($class_name)) {
+            return $class_name::getName();
+        }
+        return '';
     }
 
     /**
diff --git a/libraries/classes/UserPassword.php b/libraries/classes/UserPassword.php
index 0ab3f23a12..a6fb8b8c32 100644
--- a/libraries/classes/UserPassword.php
+++ b/libraries/classes/UserPassword.php
@@ -78,16 +78,16 @@ class UserPassword
         $error = false;
         $message = Message::success(__('The profile has been updated.'));
 
-        if (($_REQUEST['nopass'] != '1')) {
-            if (strlen($_REQUEST['pma_pw']) === 0 || strlen($_REQUEST['pma_pw2']) === 0) {
+        if (($_POST['nopass'] != '1')) {
+            if (strlen($_POST['pma_pw']) === 0 || strlen($_POST['pma_pw2']) === 0) {
                 $message = Message::error(__('The password is empty!'));
                 $error = true;
-            } elseif ($_REQUEST['pma_pw'] !== $_REQUEST['pma_pw2']) {
+            } elseif ($_POST['pma_pw'] !== $_POST['pma_pw2']) {
                 $message = Message::error(
                     __('The passwords aren\'t the same!')
                 );
                 $error = true;
-            } elseif (strlen($_REQUEST['pma_pw']) > 256) {
+            } elseif (strlen($_POST['pma_pw']) > 256) {
                 $message = Message::error(__('Password is too long!'));
                 $error = true;
             }
@@ -115,10 +115,10 @@ class UserPassword
         $serverType = Util::getServerType();
         $serverVersion = $GLOBALS['dbi']->getVersion();
 
-        if (isset($_REQUEST['authentication_plugin'])
-            && ! empty($_REQUEST['authentication_plugin'])
+        if (isset($_POST['authentication_plugin'])
+            && ! empty($_POST['authentication_plugin'])
         ) {
-            $orig_auth_plugin = $_REQUEST['authentication_plugin'];
+            $orig_auth_plugin = $_POST['authentication_plugin'];
         } else {
             $orig_auth_plugin = $this->serverPrivileges->getCurrentAuthenticationPlugin(
                 'change',
@@ -175,7 +175,7 @@ class UserPassword
     private function changePassHashingFunction()
     {
         if (Core::isValid(
-            $_REQUEST['authentication_plugin'],
+            $_POST['authentication_plugin'],
             'identical',
             'mysql_old_password'
         )) {
diff --git a/libraries/mult_submits.inc.php b/libraries/mult_submits.inc.php
index 2fff94e833..9923db90fb 100644
--- a/libraries/mult_submits.inc.php
+++ b/libraries/mult_submits.inc.php
@@ -38,8 +38,8 @@ $request_params = [
 ];
 
 foreach ($request_params as $one_request_param) {
-    if (isset($_REQUEST[$one_request_param])) {
-        $GLOBALS[$one_request_param] = $_REQUEST[$one_request_param];
+    if (isset($_POST[$one_request_param])) {
+        $GLOBALS[$one_request_param] = $_POST[$one_request_param];
     }
 }
 $response = Response::getInstance();
@@ -57,16 +57,16 @@ $template = new Template();
  */
 if (! empty($submit_mult)
     && $submit_mult != __('With selected:')
-    && (! empty($_REQUEST['selected_dbs'])
+    && (! empty($_POST['selected_dbs'])
     || ! empty($_POST['selected_tbl'])
     || ! empty($selected_fld)
-    || ! empty($_REQUEST['rows_to_delete']))
+    || ! empty($_POST['rows_to_delete']))
 ) {
     define('PMA_SUBMIT_MULT', 1);
-    if (! empty($_REQUEST['selected_dbs'])) {
+    if (! empty($_POST['selected_dbs'])) {
         // coming from server database view - do something with
         // selected databases
-        $selected   = $_REQUEST['selected_dbs'];
+        $selected   = $_POST['selected_dbs'];
         $query_type = 'drop_db';
     } elseif (! empty($_POST['selected_tbl'])) {
         // coming from database structure view - do something with
diff --git a/libraries/replication.inc.php b/libraries/replication.inc.php
index 04df52961d..98d6df0cb8 100644
--- a/libraries/replication.inc.php
+++ b/libraries/replication.inc.php
@@ -23,7 +23,7 @@ $server_master_replication = $GLOBALS['dbi']->fetchResult('SHOW MASTER STATUS');
 /**
  * set selected master server
  */
-if (! empty($_REQUEST['master_connection'])) {
+if (! empty($_POST['master_connection'])) {
     /**
      * check for multi-master replication functionality
      */
@@ -34,10 +34,10 @@ if (! empty($_REQUEST['master_connection'])) {
         $GLOBALS['dbi']->query(
             "SET @@default_master_connection = '"
             . $GLOBALS['dbi']->escapeString(
-                $_REQUEST['master_connection']
+                $_POST['master_connection']
             ) . "'"
         );
-        $GLOBALS['url_params']['master_connection'] = $_REQUEST['master_connection'];
+        $GLOBALS['url_params']['master_connection'] = $_POST['master_connection'];
     }
 }
 
diff --git a/libraries/tbl_columns_definition_form.inc.php b/libraries/tbl_columns_definition_form.inc.php
index 0a4aab4456..d93c28665a 100644
--- a/libraries/tbl_columns_definition_form.inc.php
+++ b/libraries/tbl_columns_definition_form.inc.php
@@ -64,10 +64,10 @@ if ($action == 'tbl_create.php') {
         $form_params = array_merge(
             $form_params,
             [
-            'field_where' => Util::getValueByKey($_REQUEST, 'field_where')]
+            'field_where' => Util::getValueByKey($_POST, 'field_where')]
         );
-        if (isset($_REQUEST['field_where'])) {
-            $form_params['after_field'] = $_REQUEST['after_field'];
+        if (isset($_POST['field_where'])) {
+            $form_params['after_field'] = $_POST['after_field'];
         }
     }
     $form_params['table'] = $table;
@@ -80,8 +80,8 @@ if (isset($num_fields)) {
 $form_params = array_merge(
     $form_params,
     [
-        'orig_field_where' => Util::getValueByKey($_REQUEST, 'field_where'),
-        'orig_after_field' => Util::getValueByKey($_REQUEST, 'after_field'),
+        'orig_field_where' => Util::getValueByKey($_POST, 'field_where'),
+        'orig_after_field' => Util::getValueByKey($_POST, 'after_field'),
     ]
 );
 
@@ -129,8 +129,8 @@ if (isset($field_fulltext) && is_array($field_fulltext)) {
         $submit_fulltext[$fulltext_indexkey] = $fulltext_indexkey;
     }
 }
-if (isset($_REQUEST['submit_num_fields'])
-    || isset($_REQUEST['submit_partition_change'])
+if (isset($_POST['submit_num_fields'])
+    || isset($_POST['submit_partition_change'])
 ) {
     //if adding new fields, set regenerate to keep the original values
     $regenerate = 1;
@@ -156,47 +156,47 @@ for ($columnNumber = 0; $columnNumber < $num_fields; $columnNumber++) {
             $columnMeta,
             [
                 'Field'        => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_name.${columnNumber}",
                     null
                 ),
                 'Type'         => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_type.${columnNumber}",
                     null
                 ),
                 'Collation'    => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_collation.${columnNumber}",
                     ''
                 ),
                 'Null'         => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_null.${columnNumber}",
                     ''
                 ),
                 'DefaultType'  => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_default_type.${columnNumber}",
                     'NONE'
                 ),
                 'DefaultValue' => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_default_value.${columnNumber}",
                     ''
                 ),
                 'Extra'        => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_extra.${columnNumber}",
                     null
                 ),
                 'Virtuality'   => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_virtuality.${columnNumber}",
                     ''
                 ),
                 'Expression'   => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_expression.${columnNumber}",
                     ''
                 ),
@@ -206,7 +206,7 @@ for ($columnNumber = 0; $columnNumber < $num_fields; $columnNumber++) {
         $columnMeta['Key'] = '';
         $parts = explode(
             '_',
-            Util::getValueByKey($_REQUEST, "field_key.${columnNumber}", ''),
+            Util::getValueByKey($_POST, "field_key.${columnNumber}", ''),
             2
         );
         if (count($parts) == 2 && $parts[1] == $columnNumber) {
@@ -242,27 +242,27 @@ for ($columnNumber = 0; $columnNumber < $num_fields; $columnNumber++) {
                 break;
         }
 
-        $length = Util::getValueByKey($_REQUEST, "field_length.${columnNumber}", $length);
+        $length = Util::getValueByKey($_POST, "field_length.${columnNumber}", $length);
         $submit_attribute = Util::getValueByKey(
-            $_REQUEST,
+            $_POST,
             "field_attribute.${columnNumber}",
             false
         );
         $comments_map[$columnMeta['Field']] = Util::getValueByKey(
-            $_REQUEST,
+            $_POST,
             "field_comments.${columnNumber}"
         );
 
         $mime_map[$columnMeta['Field']] = array_merge(
             $mime_map[$columnMeta['Field']],
             [
-                'mimetype' => Util::getValueByKey($_REQUEST, "field_mimetype.${$columnNumber}"),
+                'mimetype' => Util::getValueByKey($_POST, "field_mimetype.${$columnNumber}"),
                 'transformation' => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_transformation.${$columnNumber}"
                 ),
                 'transformation_options' => Util::getValueByKey(
-                    $_REQUEST,
+                    $_POST,
                     "field_transformation_options.${$columnNumber}"
                 ),
             ]
@@ -472,17 +472,17 @@ $html = $template->render('columns_definitions/column_definitions_form', [
     'form_params' => $form_params,
     'content_cells' => $content_cells,
     'partition_details' => $partitionDetails,
-    'primary_indexes' => isset($_REQUEST['primary_indexes']) ? $_REQUEST['primary_indexes'] : null,
-    'unique_indexes' => isset($_REQUEST['unique_indexes']) ? $_REQUEST['unique_indexes'] : null,
-    'indexes' => isset($_REQUEST['indexes']) ? $_REQUEST['indexes'] : null,
-    'fulltext_indexes' => isset($_REQUEST['fulltext_indexes']) ? $_REQUEST['fulltext_indexes'] : null,
-    'spatial_indexes' => isset($_REQUEST['spatial_indexes']) ? $_REQUEST['spatial_indexes'] : null,
-    'table' => isset($_REQUEST['table']) ? $_REQUEST['table'] : null,
-    'comment' => isset($_REQUEST['comment']) ? $_REQUEST['comment'] : null,
-    'tbl_collation' => isset($_REQUEST['tbl_collation']) ? $_REQUEST['tbl_collation'] : null,
-    'tbl_storage_engine' => isset($_REQUEST['tbl_storage_engine']) ? $_REQUEST['tbl_storage_engine'] : null,
-    'connection' => isset($_REQUEST['connection']) ? $_REQUEST['connection'] : null,
-    'change_column' => isset($_REQUEST['change_column']) ? $_REQUEST['change_column'] : null,
+    'primary_indexes' => isset($_POST['primary_indexes']) ? $_POST['primary_indexes'] : null,
+    'unique_indexes' => isset($_POST['unique_indexes']) ? $_POST['unique_indexes'] : null,
+    'indexes' => isset($_POST['indexes']) ? $_POST['indexes'] : null,
+    'fulltext_indexes' => isset($_POST['fulltext_indexes']) ? $_POST['fulltext_indexes'] : null,
+    'spatial_indexes' => isset($_POST['spatial_indexes']) ? $_POST['spatial_indexes'] : null,
+    'table' => isset($_POST['table']) ? $_POST['table'] : null,
+    'comment' => isset($_POST['comment']) ? $_POST['comment'] : null,
+    'tbl_collation' => isset($_POST['tbl_collation']) ? $_POST['tbl_collation'] : null,
+    'tbl_storage_engine' => isset($_POST['tbl_storage_engine']) ? $_POST['tbl_storage_engine'] : null,
+    'connection' => isset($_POST['connection']) ? $_POST['connection'] : null,
+    'change_column' => isset($_POST['change_column']) ? $_POST['change_column'] : null,
     'is_virtual_columns_supported' => Util::isVirtualColumnsSupported(),
     'browse_mime' => isset($GLOBALS['cfg']['BrowseMIME']) ? $GLOBALS['cfg']['BrowseMIME'] : null,
     'server_type' => Util::getServerType(),
diff --git a/libraries/tbl_partition_definition.inc.php b/libraries/tbl_partition_definition.inc.php
index 10cea595c2..6fae1bcc82 100644
--- a/libraries/tbl_partition_definition.inc.php
+++ b/libraries/tbl_partition_definition.inc.php
@@ -18,21 +18,21 @@ if (!isset($partitionDetails)) {
         'subpartition_by', 'subpartition_expr',
     ];
     foreach ($partitionParams as $partitionParam) {
-        $partitionDetails[$partitionParam] = isset($_REQUEST[$partitionParam])
-            ? $_REQUEST[$partitionParam] : '';
+        $partitionDetails[$partitionParam] = isset($_POST[$partitionParam])
+            ? $_POST[$partitionParam] : '';
     }
 
-    if (Core::isValid($_REQUEST['partition_count'], 'numeric')) {
+    if (Core::isValid($_POST['partition_count'], 'numeric')) {
         // MySQL's limit is 8192, so do not allow more
-        $partition_count = min(intval($_REQUEST['partition_count']), 8192);
+        $partition_count = min(intval($_POST['partition_count']), 8192);
     } else {
         $partition_count = 0;
     }
     $partitionDetails['partition_count']
         = ($partition_count === 0) ? '' : $partition_count;
-    if (Core::isValid($_REQUEST['subpartition_count'], 'numeric')) {
+    if (Core::isValid($_POST['subpartition_count'], 'numeric')) {
         // MySQL's limit is 8192, so do not allow more
-        $subpartition_count = min(intval($_REQUEST['subpartition_count']), 8192);
+        $subpartition_count = min(intval($_POST['subpartition_count']), 8192);
     } else {
         $subpartition_count = 0;
     }
@@ -41,23 +41,23 @@ if (!isset($partitionDetails)) {
 
     // Only LIST and RANGE type parameters allow subpartitioning
     $partitionDetails['can_have_subpartitions'] = $partition_count > 1
-        && isset($_REQUEST['partition_by'])
-        && ($_REQUEST['partition_by'] == 'RANGE'
-        || $_REQUEST['partition_by'] == 'RANGE COLUMNS'
-        || $_REQUEST['partition_by'] == 'LIST'
-        || $_REQUEST['partition_by'] == 'LIST COLUMNS');
+        && isset($_POST['partition_by'])
+        && ($_POST['partition_by'] == 'RANGE'
+        || $_POST['partition_by'] == 'RANGE COLUMNS'
+        || $_POST['partition_by'] == 'LIST'
+        || $_POST['partition_by'] == 'LIST COLUMNS');
 
     // Values are specified only for LIST and RANGE type partitions
-    $partitionDetails['value_enabled'] = isset($_REQUEST['partition_by'])
-        && ($_REQUEST['partition_by'] == 'RANGE'
-        || $_REQUEST['partition_by'] == 'RANGE COLUMNS'
-        || $_REQUEST['partition_by'] == 'LIST'
-        || $_REQUEST['partition_by'] == 'LIST COLUMNS');
+    $partitionDetails['value_enabled'] = isset($_POST['partition_by'])
+        && ($_POST['partition_by'] == 'RANGE'
+        || $_POST['partition_by'] == 'RANGE COLUMNS'
+        || $_POST['partition_by'] == 'LIST'
+        || $_POST['partition_by'] == 'LIST COLUMNS');
 
     // Has partitions
     if ($partition_count > 1) {
-        $partitions = isset($_REQUEST['partitions'])
-            ? $_REQUEST['partitions']
+        $partitions = isset($_POST['partitions'])
+            ? $_POST['partitions']
             : [];
 
         // Remove details of the additional partitions
diff --git a/navigation.php b/navigation.php
index 622c7e4219..a8b89516dd 100644
--- a/navigation.php
+++ b/navigation.php
@@ -26,7 +26,7 @@ if (! $response->isAjax()) {
     exit;
 }
 
-if (isset($_REQUEST['getNaviSettings']) && $_REQUEST['getNaviSettings']) {
+if (isset($_POST['getNaviSettings']) && $_POST['getNaviSettings']) {
     $response->addJSON('message', PageSettings::getNaviSettings());
     exit();
 }
@@ -34,41 +34,41 @@ if (isset($_REQUEST['getNaviSettings']) && $_REQUEST['getNaviSettings']) {
 $relation = new Relation($GLOBALS['dbi']);
 $cfgRelation = $relation->getRelationsParam();
 if ($cfgRelation['navwork']) {
-    if (isset($_REQUEST['hideNavItem'])) {
-        if (! empty($_REQUEST['itemName'])
-            && ! empty($_REQUEST['itemType'])
-            && ! empty($_REQUEST['dbName'])
+    if (isset($_POST['hideNavItem'])) {
+        if (! empty($_POST['itemName'])
+            && ! empty($_POST['itemType'])
+            && ! empty($_POST['dbName'])
         ) {
             $navigation->hideNavigationItem(
-                $_REQUEST['itemName'],
-                $_REQUEST['itemType'],
-                $_REQUEST['dbName'],
-                (! empty($_REQUEST['tableName']) ? $_REQUEST['tableName'] : null)
+                $_POST['itemName'],
+                $_POST['itemType'],
+                $_POST['dbName'],
+                (! empty($_POST['tableName']) ? $_POST['tableName'] : null)
             );
         }
         exit;
     }
 
-    if (isset($_REQUEST['unhideNavItem'])) {
-        if (! empty($_REQUEST['itemName'])
-            && ! empty($_REQUEST['itemType'])
-            && ! empty($_REQUEST['dbName'])
+    if (isset($_POST['unhideNavItem'])) {
+        if (! empty($_POST['itemName'])
+            && ! empty($_POST['itemType'])
+            && ! empty($_POST['dbName'])
         ) {
             $navigation->unhideNavigationItem(
-                $_REQUEST['itemName'],
-                $_REQUEST['itemType'],
-                $_REQUEST['dbName'],
-                (! empty($_REQUEST['tableName']) ? $_REQUEST['tableName'] : null)
+                $_POST['itemName'],
+                $_POST['itemType'],
+                $_POST['dbName'],
+                (! empty($_POST['tableName']) ? $_POST['tableName'] : null)
             );
         }
         exit;
     }
 
-    if (isset($_REQUEST['showUnhideDialog'])) {
-        if (! empty($_REQUEST['dbName'])) {
+    if (isset($_POST['showUnhideDialog'])) {
+        if (! empty($_POST['dbName'])) {
             $response->addJSON(
                 'message',
-                $navigation->getItemUnhideDialog($_REQUEST['dbName'])
+                $navigation->getItemUnhideDialog($_POST['dbName'])
             );
         }
         exit;
diff --git a/normalization.php b/normalization.php
index 6ca8330700..53252bd049 100644
--- a/normalization.php
+++ b/normalization.php
@@ -16,7 +16,7 @@ require_once 'libraries/common.inc.php';
 
 $normalization = new Normalization($GLOBALS['dbi']);
 
-if (isset($_REQUEST['getColumns'])) {
+if (isset($_POST['getColumns'])) {
     $html = '<option selected disabled>' . __('Select one…') . '</option>'
         . '<option value="no_such_col">' . __('No such column') . '</option>';
     //get column whose datatype falls under string category
@@ -28,14 +28,14 @@ if (isset($_REQUEST['getColumns'])) {
     echo $html;
     exit;
 }
-if (isset($_REQUEST['splitColumn'])) {
-    $num_fields = min(4096, intval($_REQUEST['numFields']));
+if (isset($_POST['splitColumn'])) {
+    $num_fields = min(4096, intval($_POST['numFields']));
     $html = $normalization->getHtmlForCreateNewColumn($num_fields, $db, $table);
     $html .= Url::getHiddenInputs($db, $table);
     echo $html;
     exit;
 }
-if (isset($_REQUEST['addNewPrimary'])) {
+if (isset($_POST['addNewPrimary'])) {
     $num_fields = 1;
     $columnMeta = ['Field' => $table . "_id", 'Extra' => 'auto_increment'];
     $html = $normalization->getHtmlForCreateNewColumn(
@@ -48,14 +48,14 @@ if (isset($_REQUEST['addNewPrimary'])) {
     echo $html;
     exit;
 }
-if (isset($_REQUEST['findPdl'])) {
+if (isset($_POST['findPdl'])) {
     $html = $normalization->findPartialDependencies($table, $db);
     echo $html;
     exit;
 }
 
-if (isset($_REQUEST['getNewTables2NF'])) {
-    $partialDependencies = json_decode($_REQUEST['pd']);
+if (isset($_POST['getNewTables2NF'])) {
+    $partialDependencies = json_decode($_POST['pd']);
     $html = $normalization->getHtmlForNewTables2NF($partialDependencies, $table);
     echo $html;
     exit;
@@ -63,9 +63,9 @@ if (isset($_REQUEST['getNewTables2NF'])) {
 
 $response = Response::getInstance();
 
-if (isset($_REQUEST['getNewTables3NF'])) {
-    $dependencies = json_decode($_REQUEST['pd']);
-    $tables = json_decode($_REQUEST['tables']);
+if (isset($_POST['getNewTables3NF'])) {
+    $dependencies = json_decode($_POST['pd']);
+    $tables = json_decode($_POST['tables']);
     $newTables = $normalization->getHtmlForNewTables3NF($dependencies, $tables, $db);
     $response->disable();
     Core::headerJSON();
@@ -78,18 +78,18 @@ $scripts = $header->getScripts();
 $scripts->addFile('normalization.js');
 $scripts->addFile('vendor/jquery/jquery.uitablefilter.js');
 $normalForm = '1nf';
-if (Core::isValid($_REQUEST['normalizeTo'], ['1nf', '2nf', '3nf'])) {
-    $normalForm = $_REQUEST['normalizeTo'];
+if (Core::isValid($_POST['normalizeTo'], ['1nf', '2nf', '3nf'])) {
+    $normalForm = $_POST['normalizeTo'];
 }
-if (isset($_REQUEST['createNewTables2NF'])) {
-    $partialDependencies = json_decode($_REQUEST['pd']);
-    $tablesName = json_decode($_REQUEST['newTablesName']);
+if (isset($_POST['createNewTables2NF'])) {
+    $partialDependencies = json_decode($_POST['pd']);
+    $tablesName = json_decode($_POST['newTablesName']);
     $res = $normalization->createNewTablesFor2NF($partialDependencies, $tablesName, $table, $db);
     $response->addJSON($res);
     exit;
 }
-if (isset($_REQUEST['createNewTables3NF'])) {
-    $newtables = json_decode($_REQUEST['newTables']);
+if (isset($_POST['createNewTables3NF'])) {
+    $newtables = json_decode($_POST['newTables']);
     $res = $normalization->createNewTablesFor3NF($newtables, $db);
     $response->addJSON($res);
     exit;
@@ -110,23 +110,23 @@ if (isset($_POST['repeatingColumns'])) {
     $response->addJSON($res);
     exit;
 }
-if (isset($_REQUEST['step1'])) {
+if (isset($_POST['step1'])) {
     $html = $normalization->getHtmlFor1NFStep1($db, $table, $normalForm);
     $response->addHTML($html);
-} elseif (isset($_REQUEST['step2'])) {
+} elseif (isset($_POST['step2'])) {
     $res = $normalization->getHtmlContentsFor1NFStep2($db, $table);
     $response->addJSON($res);
-} elseif (isset($_REQUEST['step3'])) {
+} elseif (isset($_POST['step3'])) {
     $res = $normalization->getHtmlContentsFor1NFStep3($db, $table);
     $response->addJSON($res);
-} elseif (isset($_REQUEST['step4'])) {
+} elseif (isset($_POST['step4'])) {
     $res = $normalization->getHtmlContentsFor1NFStep4($db, $table);
     $response->addJSON($res);
-} elseif (isset($_REQUEST['step']) && $_REQUEST['step'] == '2.1') {
+} elseif (isset($_POST['step']) && $_POST['step'] == '2.1') {
     $res = $normalization->getHtmlFor2NFstep1($db, $table);
     $response->addJSON($res);
-} elseif (isset($_REQUEST['step']) && $_REQUEST['step'] == '3.1') {
-    $tables = $_REQUEST['tables'];
+} elseif (isset($_POST['step']) && $_POST['step'] == '3.1') {
+    $tables = $_POST['tables'];
     $res = $normalization->getHtmlFor3NFstep1($db, $tables);
     $response->addJSON($res);
 } else {
diff --git a/server_privileges.php b/server_privileges.php
index 59e427a098..4ee82c97f2 100644
--- a/server_privileges.php
+++ b/server_privileges.php
@@ -42,8 +42,8 @@ $template = new Template();
 $relationCleanup = new RelationCleanup($GLOBALS['dbi'], $relation);
 $serverPrivileges = new Privileges($template, $GLOBALS['dbi'], $relation, $relationCleanup);
 
-if ((isset($_REQUEST['viewing_mode'])
-    && $_REQUEST['viewing_mode'] == 'server')
+if ((isset($_GET['viewing_mode'])
+    && $_GET['viewing_mode'] == 'server')
     && $GLOBALS['cfgRelation']['menuswork']
 ) {
     $response->addHTML('<div>');
@@ -161,8 +161,8 @@ if (! $GLOBALS['is_grantuser'] && !$GLOBALS['is_createuser']) {
  * Checks if the user is using "Change Login Information / Copy User" dialog
  * only to update the password
  */
-if (isset($_REQUEST['change_copy']) && $username == $_REQUEST['old_username']
-    && $hostname == $_REQUEST['old_hostname']
+if (isset($_POST['change_copy']) && $username == $_POST['old_username']
+    && $hostname == $_POST['old_hostname']
 ) {
     $response->addHTML(
         Message::error(
@@ -207,7 +207,7 @@ if (isset($ret_message)) {
 /**
  * Changes / copies a user, part III
  */
-if (isset($_REQUEST['change_copy'])) {
+if (isset($_POST['change_copy'])) {
     $queries = $serverPrivileges->getDbSpecificPrivsQueriesForChangeOrCopyUser(
         $queries,
         $username,
@@ -254,17 +254,17 @@ if (! empty($_POST['update_privs'])) {
 /**
  * Assign users to user groups
  */
-if (! empty($_REQUEST['changeUserGroup']) && $cfgRelation['menuswork']
+if (! empty($_POST['changeUserGroup']) && $cfgRelation['menuswork']
     && $GLOBALS['dbi']->isSuperuser() && $GLOBALS['is_createuser']
 ) {
-    $serverPrivileges->setUserGroup($username, $_REQUEST['userGroup']);
+    $serverPrivileges->setUserGroup($username, $_POST['userGroup']);
     $message = Message::success();
 }
 
 /**
  * Revokes Privileges
  */
-if (isset($_REQUEST['revokeall'])) {
+if (isset($_POST['revokeall'])) {
     list ($message, $sql_query) = $serverPrivileges->getMessageAndSqlQueryForPrivilegesRevoke(
         (isset($dbname) ? $dbname : ''),
         (isset($tablename)
@@ -279,7 +279,7 @@ if (isset($_REQUEST['revokeall'])) {
 /**
  * Updates the password
  */
-if (isset($_REQUEST['change_pw'])) {
+if (isset($_POST['change_pw'])) {
     $message = $serverPrivileges->updatePassword(
         $err_url,
         $username,
@@ -291,11 +291,11 @@ if (isset($_REQUEST['change_pw'])) {
  * Deletes users
  *   (Changes / copies a user, part IV)
  */
-if (isset($_REQUEST['delete'])
-    || (isset($_REQUEST['change_copy']) && $_REQUEST['mode'] < 4)
+if (isset($_POST['delete'])
+    || (isset($_POST['change_copy']) && $_POST['mode'] < 4)
 ) {
     $queries = $serverPrivileges->getDataForDeleteUsers($queries);
-    if (empty($_REQUEST['change_copy'])) {
+    if (empty($_POST['change_copy'])) {
         list($sql_query, $message) = $serverPrivileges->deleteUser($queries);
     }
 }
@@ -303,7 +303,7 @@ if (isset($_REQUEST['delete'])
 /**
  * Changes / copies a user, part V
  */
-if (isset($_REQUEST['change_copy'])) {
+if (isset($_POST['change_copy'])) {
     $queries = $serverPrivileges->getDataForQueries($queries, $queries_for_display);
     $message = Message::success();
     $sql_query = join("\n", $queries);
@@ -324,14 +324,13 @@ if (! is_null($message_ret)) {
  */
 if ($response->isAjax()
     && empty($_REQUEST['ajax_page_request'])
-    && ! isset($_REQUEST['export'])
-    && (! isset($_REQUEST['submit_mult']) || $_REQUEST['submit_mult'] != 'export')
-    && ((! isset($_REQUEST['initial']) || $_REQUEST['initial'] === null
-    || $_REQUEST['initial'] === '')
-    || (isset($_REQUEST['delete']) && $_REQUEST['delete'] === __('Go')))
-    && ! isset($_REQUEST['showall'])
-    && ! isset($_REQUEST['edit_user_group_dialog'])
-    && ! isset($_REQUEST['db_specific'])
+    && ! isset($_GET['export'])
+    && (! isset($_POST['submit_mult']) || $_POST['submit_mult'] != 'export')
+    && ((! isset($_GET['initial']) || $_GET['initial'] === null
+    || $_GET['initial'] === '')
+    || (isset($_POST['delete']) && $_POST['delete'] === __('Go')))
+    && ! isset($_GET['showall'])
+    && ! isset($_GET['edit_user_group_dialog'])
 ) {
     $extra_data = $serverPrivileges->getExtraDataForAjaxBehavior(
         (isset($password) ? $password : ''),
@@ -351,8 +350,8 @@ if ($response->isAjax()
 /**
  * Displays the links
  */
-if (isset($_REQUEST['viewing_mode']) && $_REQUEST['viewing_mode'] == 'db') {
-    $GLOBALS['db'] = $_REQUEST['db'] = $_REQUEST['checkprivsdb'];
+if (isset($_GET['viewing_mode']) && $_GET['viewing_mode'] == 'db') {
+    $GLOBALS['db'] = $_REQUEST['db'] = $_GET['checkprivsdb'];
 
     $url_query .= '&amp;goto=db_operations.php';
 
@@ -393,8 +392,8 @@ $response->addHTML(
 );
 
 // export user definition
-if (isset($_REQUEST['export'])
-    || (isset($_REQUEST['submit_mult']) && $_REQUEST['submit_mult'] == 'export')
+if (isset($_GET['export'])
+    || (isset($_POST['submit_mult']) && $_POST['submit_mult'] == 'export')
 ) {
     list($title, $export) = $serverPrivileges->getListForExportUserDefinition(
         isset($username) ? $username : null,
@@ -412,24 +411,24 @@ if (isset($_REQUEST['export'])
     }
 }
 
-if (isset($_REQUEST['adduser'])) {
+if (isset($_GET['adduser'])) {
     // Add user
     $response->addHTML(
         $serverPrivileges->getHtmlForAddUser((isset($dbname) ? $dbname : ''))
     );
-} elseif (isset($_REQUEST['checkprivsdb'])) {
-    if (isset($_REQUEST['checkprivstable'])) {
+} elseif (isset($_GET['checkprivsdb'])) {
+    if (isset($_GET['checkprivstable'])) {
         // check the privileges for a particular table.
         $response->addHTML(
             $serverPrivileges->getHtmlForSpecificTablePrivileges(
-                $_REQUEST['checkprivsdb'],
-                $_REQUEST['checkprivstable']
+                $_GET['checkprivsdb'],
+                $_GET['checkprivstable']
             )
         );
     } else {
         // check the privileges for a particular database.
         $response->addHTML(
-            $serverPrivileges->getHtmlForSpecificDbPrivileges($_REQUEST['checkprivsdb'])
+            $serverPrivileges->getHtmlForSpecificDbPrivileges($_GET['checkprivsdb'])
         );
     }
 } else {
@@ -478,7 +477,7 @@ if (isset($_REQUEST['adduser'])) {
     }
 }
 
-if ((isset($_REQUEST['viewing_mode']) && $_REQUEST['viewing_mode'] == 'server')
+if ((isset($_GET['viewing_mode']) && $_GET['viewing_mode'] == 'server')
     && $GLOBALS['cfgRelation']['menuswork']
 ) {
     $response->addHTML('</div>');
diff --git a/server_replication.php b/server_replication.php
index f48d631376..92ce0ae140 100644
--- a/server_replication.php
+++ b/server_replication.php
@@ -43,10 +43,10 @@ if (! $GLOBALS['dbi']->isSuperuser()) {
     exit;
 }
 
-// change $GLOBALS['url_params'] with $_REQUEST['url_params']
+// change $GLOBALS['url_params'] with $_POST['url_params']
 // only if it is an array
-if (isset($_REQUEST['url_params']) && is_array($_REQUEST['url_params'])) {
-    $GLOBALS['url_params'] = $_REQUEST['url_params'];
+if (isset($_POST['url_params']) && is_array($_POST['url_params'])) {
+    $GLOBALS['url_params'] = $_POST['url_params'];
 }
 
 $replicationGui = new ReplicationGui();
@@ -69,13 +69,13 @@ $response->addHTML($replicationGui->getHtmlForErrorMessage());
 
 if ($GLOBALS['replication_info']['master']['status']) {
     $response->addHTML($replicationGui->getHtmlForMasterReplication());
-} elseif (! isset($_REQUEST['mr_configure'])
-    && ! isset($_REQUEST['repl_clear_scr'])
+} elseif (! isset($_POST['mr_configure'])
+    && ! isset($_POST['repl_clear_scr'])
 ) {
     $response->addHTML($replicationGui->getHtmlForNotServerReplication());
 }
 
-if (isset($_REQUEST['mr_configure'])) {
+if (isset($_POST['mr_configure'])) {
     // Render the 'Master configuration' section
     $response->addHTML($replicationGui->getHtmlForMasterConfiguration());
     exit;
@@ -83,7 +83,7 @@ if (isset($_REQUEST['mr_configure'])) {
 
 $response->addHTML('</div>');
 
-if (! isset($_REQUEST['repl_clear_scr'])) {
+if (! isset($_POST['repl_clear_scr'])) {
     // Render the 'Slave configuration' section
     $response->addHTML(
         $replicationGui->getHtmlForSlaveConfiguration(
@@ -92,6 +92,6 @@ if (! isset($_REQUEST['repl_clear_scr'])) {
         )
     );
 }
-if (isset($_REQUEST['sl_configure'])) {
+if (isset($_POST['sl_configure'])) {
     $response->addHTML($replicationGui->getHtmlForReplicationChangeMaster("slave_changemaster"));
 }
diff --git a/server_status_monitor.php b/server_status_monitor.php
index ff9263e32a..94068972cd 100644
--- a/server_status_monitor.php
+++ b/server_status_monitor.php
@@ -28,8 +28,8 @@ if ($response->isAjax()) {
     header('Content-Type: text/html; charset=UTF-8');
 
     // real-time charting data
-    if (isset($_REQUEST['chart_data'])) {
-        switch ($_REQUEST['type']) {
+    if (isset($_POST['chart_data'])) {
+        switch ($_POST['type']) {
             case 'chartgrid': // Data for the monitor
                 $ret = $statusMonitor->getJsonForChartingData();
                 $response->addJSON('message', $ret);
@@ -37,30 +37,30 @@ if ($response->isAjax()) {
         }
     }
 
-    if (isset($_REQUEST['log_data'])) {
-        $start = intval($_REQUEST['time_start']);
-        $end = intval($_REQUEST['time_end']);
+    if (isset($_POST['log_data'])) {
+        $start = intval($_POST['time_start']);
+        $end = intval($_POST['time_end']);
 
-        if ($_REQUEST['type'] == 'slow') {
+        if ($_POST['type'] == 'slow') {
             $return = $statusMonitor->getJsonForLogDataTypeSlow($start, $end);
             $response->addJSON('message', $return);
             exit;
         }
 
-        if ($_REQUEST['type'] == 'general') {
+        if ($_POST['type'] == 'general') {
             $return = $statusMonitor->getJsonForLogDataTypeGeneral($start, $end);
             $response->addJSON('message', $return);
             exit;
         }
     }
 
-    if (isset($_REQUEST['logging_vars'])) {
+    if (isset($_POST['logging_vars'])) {
         $loggingVars = $statusMonitor->getJsonForLoggingVars();
         $response->addJSON('message', $loggingVars);
         exit;
     }
 
-    if (isset($_REQUEST['query_analyzer'])) {
+    if (isset($_POST['query_analyzer'])) {
         $return = $statusMonitor->getJsonForQueryAnalyzer();
         $response->addJSON('message', $return);
         exit;
diff --git a/server_status_processes.php b/server_status_processes.php
index e46b07a8ad..6dc1cd8b3d 100644
--- a/server_status_processes.php
+++ b/server_status_processes.php
@@ -26,8 +26,8 @@ $response = Response::getInstance();
  * Kills a selected process
  * on ajax request
  */
-if ($response->isAjax() && !empty($_REQUEST['kill'])) {
-    $kill = intval($_REQUEST['kill']);
+if ($response->isAjax() && !empty($_POST['kill'])) {
+    $kill = intval($_POST['kill']);
     $query = $GLOBALS['dbi']->getKillQuery($kill);
     if ($GLOBALS['dbi']->tryQuery($query)) {
         $message = PhpMyAdmin\Message::success(
@@ -45,7 +45,7 @@ if ($response->isAjax() && !empty($_REQUEST['kill'])) {
     }
     $message->addParam($kill);
     $response->addJSON('message', $message);
-} elseif ($response->isAjax() && !empty($_REQUEST['refresh'])) {
+} elseif ($response->isAjax() && !empty($_POST['refresh'])) {
     // Only sends the process list table
     $response->addHTML(Processes::getHtmlForServerProcesslist());
 } else {
diff --git a/server_status_variables.php b/server_status_variables.php
index e8dc61e6f7..c204811078 100644
--- a/server_status_variables.php
+++ b/server_status_variables.php
@@ -19,15 +19,15 @@ require_once 'libraries/replication.inc.php';
 /**
  * flush status variables if requested
  */
-if (isset($_REQUEST['flush'])) {
+if (isset($_POST['flush'])) {
     $_flush_commands = [
         'STATUS',
         'TABLES',
         'QUERY CACHE',
     ];
 
-    if (in_array($_REQUEST['flush'], $_flush_commands)) {
-        $GLOBALS['dbi']->query('FLUSH ' . $_REQUEST['flush'] . ';');
+    if (in_array($_POST['flush'], $_flush_commands)) {
+        $GLOBALS['dbi']->query('FLUSH ' . $_POST['flush'] . ';');
     }
     unset($_flush_commands);
 }
diff --git a/server_user_groups.php b/server_user_groups.php
index e885a0edda..0bd4a911c6 100644
--- a/server_user_groups.php
+++ b/server_user_groups.php
@@ -42,35 +42,35 @@ $response->addHTML(Users::getHtmlForSubMenusOnUsersPage('server_user_groups.php'
 /**
  * Delete user group
  */
-if (! empty($_REQUEST['deleteUserGroup'])) {
-    UserGroups::delete($_REQUEST['userGroup']);
+if (! empty($_POST['deleteUserGroup'])) {
+    UserGroups::delete($_POST['userGroup']);
 }
 
 /**
  * Add a new user group
  */
-if (! empty($_REQUEST['addUserGroupSubmit'])) {
-    UserGroups::edit($_REQUEST['userGroup'], true);
+if (! empty($_POST['addUserGroupSubmit'])) {
+    UserGroups::edit($_POST['userGroup'], true);
 }
 
 /**
  * Update a user group
  */
-if (! empty($_REQUEST['editUserGroupSubmit'])) {
-    UserGroups::edit($_REQUEST['userGroup']);
+if (! empty($_POST['editUserGroupSubmit'])) {
+    UserGroups::edit($_POST['userGroup']);
 }
 
-if (isset($_REQUEST['viewUsers'])) {
+if (isset($_POST['viewUsers'])) {
     // Display users belonging to a user group
-    $response->addHTML(UserGroups::getHtmlForListingUsersofAGroup($_REQUEST['userGroup']));
+    $response->addHTML(UserGroups::getHtmlForListingUsersofAGroup($_POST['userGroup']));
 }
 
-if (isset($_REQUEST['addUserGroup'])) {
+if (isset($_GET['addUserGroup'])) {
     // Display add user group dialog
     $response->addHTML(UserGroups::getHtmlToEditUserGroup());
-} elseif (isset($_REQUEST['editUserGroup'])) {
+} elseif (isset($_POST['editUserGroup'])) {
     // Display edit user group dialog
-    $response->addHTML(UserGroups::getHtmlToEditUserGroup($_REQUEST['userGroup']));
+    $response->addHTML(UserGroups::getHtmlToEditUserGroup($_POST['userGroup']));
 } else {
     // Display user groups table
     $response->addHTML(UserGroups::getHtmlForUserGroupsTable());
diff --git a/sql.php b/sql.php
index b5e7376ece..1a7f9ed487 100644
--- a/sql.php
+++ b/sql.php
@@ -83,28 +83,28 @@ if (isset($_POST['bkm_fields']['bkm_database'])) {
 }
 
 // During grid edit, if we have a relational field, show the dropdown for it.
-if (isset($_REQUEST['get_relational_values'])
-    && $_REQUEST['get_relational_values'] == true
+if (isset($_POST['get_relational_values'])
+    && $_POST['get_relational_values'] == true
 ) {
     $sql->getRelationalValues($db, $table);
     // script has exited at this point
 }
 
 // Just like above, find possible values for enum fields during grid edit.
-if (isset($_REQUEST['get_enum_values']) && $_REQUEST['get_enum_values'] == true) {
+if (isset($_POST['get_enum_values']) && $_POST['get_enum_values'] == true) {
     $sql->getEnumOrSetValues($db, $table, "enum");
     // script has exited at this point
 }
 
 
 // Find possible values for set fields during grid edit.
-if (isset($_REQUEST['get_set_values']) && $_REQUEST['get_set_values'] == true) {
+if (isset($_POST['get_set_values']) && $_POST['get_set_values'] == true) {
     $sql->getEnumOrSetValues($db, $table, "set");
     // script has exited at this point
 }
 
-if (isset($_REQUEST['get_default_fk_check_value'])
-    && $_REQUEST['get_default_fk_check_value'] == true
+if (isset($_GET['get_default_fk_check_value'])
+    && $_GET['get_default_fk_check_value'] == true
 ) {
     $response = Response::getInstance();
     $response->addJSON(
@@ -117,7 +117,7 @@ if (isset($_REQUEST['get_default_fk_check_value'])
 /**
  * Check ajax request to set the column order and visibility
  */
-if (isset($_REQUEST['set_col_prefs']) && $_REQUEST['set_col_prefs'] == true) {
+if (isset($_POST['set_col_prefs']) && $_POST['set_col_prefs'] == true) {
     $sql->setColumnOrderOrVisibility($table, $db);
     // script has exited at this point
 }
diff --git a/tbl_addfield.php b/tbl_addfield.php
index 04ecb80dad..a549e127ae 100644
--- a/tbl_addfield.php
+++ b/tbl_addfield.php
@@ -44,28 +44,28 @@ $err_url = 'tbl_sql.php' . Url::getCommon(
 $abort = false;
 
 // check number of fields to be created
-if (isset($_REQUEST['submit_num_fields'])) {
-    if (isset($_REQUEST['orig_after_field'])) {
-        $_REQUEST['after_field'] = $_REQUEST['orig_after_field'];
+if (isset($_POST['submit_num_fields'])) {
+    if (isset($_POST['orig_after_field'])) {
+        $_POST['after_field'] = $_POST['orig_after_field'];
     }
-    if (isset($_REQUEST['orig_field_where'])) {
-        $_REQUEST['field_where'] = $_REQUEST['orig_field_where'];
+    if (isset($_POST['orig_field_where'])) {
+        $_POST['field_where'] = $_POST['orig_field_where'];
     }
     $num_fields = min(
-        intval($_REQUEST['orig_num_fields']) + intval($_REQUEST['added_fields']),
+        intval($_POST['orig_num_fields']) + intval($_POST['added_fields']),
         4096
     );
     $regenerate = true;
-} elseif (isset($_REQUEST['num_fields']) && intval($_REQUEST['num_fields']) > 0) {
-    $num_fields = min(4096, intval($_REQUEST['num_fields']));
+} elseif (isset($_POST['num_fields']) && intval($_POST['num_fields']) > 0) {
+    $num_fields = min(4096, intval($_POST['num_fields']));
 } else {
     $num_fields = 1;
 }
 
-if (isset($_REQUEST['do_save_data'])) {
+if (isset($_POST['do_save_data'])) {
     //avoid an incorrect calling of PMA_updateColumns() via
     //tbl_structure.php below
-    unset($_REQUEST['do_save_data']);
+    unset($_POST['do_save_data']);
 
     $createAddField = new CreateAddField($GLOBALS['dbi']);
 
@@ -73,23 +73,23 @@ if (isset($_REQUEST['do_save_data'])) {
 
     if ($result === true) {
         // Update comment table for mime types [MIME]
-        if (isset($_REQUEST['field_mimetype'])
-            && is_array($_REQUEST['field_mimetype'])
+        if (isset($_POST['field_mimetype'])
+            && is_array($_POST['field_mimetype'])
             && $cfg['BrowseMIME']
         ) {
-            foreach ($_REQUEST['field_mimetype'] as $fieldindex => $mimetype) {
-                if (isset($_REQUEST['field_name'][$fieldindex])
-                    && strlen($_REQUEST['field_name'][$fieldindex]) > 0
+            foreach ($_POST['field_mimetype'] as $fieldindex => $mimetype) {
+                if (isset($_POST['field_name'][$fieldindex])
+                    && strlen($_POST['field_name'][$fieldindex]) > 0
                 ) {
                     $transformations->setMime(
                         $db,
                         $table,
-                        $_REQUEST['field_name'][$fieldindex],
+                        $_POST['field_name'][$fieldindex],
                         $mimetype,
-                        $_REQUEST['field_transformation'][$fieldindex],
-                        $_REQUEST['field_transformation_options'][$fieldindex],
-                        $_REQUEST['field_input_transformation'][$fieldindex],
-                        $_REQUEST['field_input_transformation_options'][$fieldindex]
+                        $_POST['field_transformation'][$fieldindex],
+                        $_POST['field_transformation_options'][$fieldindex],
+                        $_POST['field_input_transformation'][$fieldindex],
+                        $_POST['field_input_transformation_options'][$fieldindex]
                     );
                 }
             }
diff --git a/tbl_create.php b/tbl_create.php
index 89264ac265..32169193b2 100644
--- a/tbl_create.php
+++ b/tbl_create.php
@@ -67,11 +67,11 @@ $action = 'tbl_create.php';
 /**
  * The form used to define the structure of the table has been submitted
  */
-if (isset($_REQUEST['do_save_data'])) {
+if (isset($_POST['do_save_data'])) {
     $sql_query = $createAddField->getTableCreationQuery($db, $table);
 
     // If there is a request for SQL previewing.
-    if (isset($_REQUEST['preview_sql'])) {
+    if (isset($_POST['preview_sql'])) {
         Core::previewSQL($sql_query);
     }
     // Executes the query
@@ -79,23 +79,23 @@ if (isset($_REQUEST['do_save_data'])) {
 
     if ($result) {
         // Update comment table for mime types [MIME]
-        if (isset($_REQUEST['field_mimetype'])
-            && is_array($_REQUEST['field_mimetype'])
+        if (isset($_POST['field_mimetype'])
+            && is_array($_POST['field_mimetype'])
             && $cfg['BrowseMIME']
         ) {
-            foreach ($_REQUEST['field_mimetype'] as $fieldindex => $mimetype) {
-                if (isset($_REQUEST['field_name'][$fieldindex])
-                    && strlen($_REQUEST['field_name'][$fieldindex]) > 0
+            foreach ($_POST['field_mimetype'] as $fieldindex => $mimetype) {
+                if (isset($_POST['field_name'][$fieldindex])
+                    && strlen($_POST['field_name'][$fieldindex]) > 0
                 ) {
                     $transformations->setMime(
                         $db,
                         $table,
-                        $_REQUEST['field_name'][$fieldindex],
+                        $_POST['field_name'][$fieldindex],
                         $mimetype,
-                        $_REQUEST['field_transformation'][$fieldindex],
-                        $_REQUEST['field_transformation_options'][$fieldindex],
-                        $_REQUEST['field_input_transformation'][$fieldindex],
-                        $_REQUEST['field_input_transformation_options'][$fieldindex]
+                        $_POST['field_transformation'][$fieldindex],
+                        $_POST['field_transformation_options'][$fieldindex],
+                        $_POST['field_input_transformation'][$fieldindex],
+                        $_POST['field_input_transformation_options'][$fieldindex]
                     );
                 }
             }
diff --git a/tbl_export.php b/tbl_export.php
index 98ced269e6..fd20b3189c 100644
--- a/tbl_export.php
+++ b/tbl_export.php
@@ -31,7 +31,7 @@ $cfgRelation = $relation->getRelationsParam();
 $displayExport = new Export();
 
 // handling export template actions
-if (isset($_REQUEST['templateAction']) && $cfgRelation['exporttemplateswork']) {
+if (isset($_POST['templateAction']) && $cfgRelation['exporttemplateswork']) {
     $displayExport->handleTemplateActions($cfgRelation);
     exit;
 }
diff --git a/tbl_indexes.php b/tbl_indexes.php
index 9fb46b376f..c6025ddec7 100644
--- a/tbl_indexes.php
+++ b/tbl_indexes.php
@@ -28,15 +28,15 @@ $db = $container->get('db');
 $table = $container->get('table');
 $dbi = $container->get('dbi');
 
-if (!isset($_REQUEST['create_edit_table'])) {
+if (!isset($_POST['create_edit_table'])) {
     include_once 'libraries/tbl_common.inc.php';
 }
-if (isset($_REQUEST['index'])) {
-    if (is_array($_REQUEST['index'])) {
+if (isset($_POST['index'])) {
+    if (is_array($_POST['index'])) {
         // coming already from form
-        $index = new Index($_REQUEST['index']);
+        $index = new Index($_POST['index']);
     } else {
-        $index = $dbi->getTable($db, $table)->getIndex($_REQUEST['index']);
+        $index = $dbi->getTable($db, $table)->getIndex($_POST['index']);
     }
 } else {
     $index = new Index();
diff --git a/tbl_operations.php b/tbl_operations.php
index 717053a111..4b68aaa3fa 100644
--- a/tbl_operations.php
+++ b/tbl_operations.php
@@ -102,7 +102,7 @@ $table_alters = [];
 /**
  * If the table has to be moved to some other database
  */
-if (isset($_REQUEST['submit_move']) || isset($_REQUEST['submit_copy'])) {
+if (isset($_POST['submit_move']) || isset($_POST['submit_copy'])) {
     //$_message = '';
     $operations->moveOrCopyTable($db, $table);
     // This was ended in an Ajax call
@@ -111,31 +111,31 @@ if (isset($_REQUEST['submit_move']) || isset($_REQUEST['submit_copy'])) {
 /**
  * If the table has to be maintained
  */
-if (isset($_REQUEST['table_maintenance'])) {
+if (isset($_POST['table_maintenance'])) {
     include_once 'sql.php';
     unset($result);
 }
 /**
  * Updates table comment, type and options if required
  */
-if (isset($_REQUEST['submitoptions'])) {
+if (isset($_POST['submitoptions'])) {
     $_message = '';
     $warning_messages = [];
 
-    if (isset($_REQUEST['new_name'])) {
+    if (isset($_POST['new_name'])) {
         // Get original names before rename operation
         $oldTable = $pma_table->getName();
         $oldDb = $pma_table->getDbName();
 
-        if ($pma_table->rename($_REQUEST['new_name'])) {
-            if (isset($_REQUEST['adjust_privileges'])
-                && ! empty($_REQUEST['adjust_privileges'])
+        if ($pma_table->rename($_POST['new_name'])) {
+            if (isset($_POST['adjust_privileges'])
+                && ! empty($_POST['adjust_privileges'])
             ) {
                 $operations->adjustPrivilegesRenameOrMoveTable(
                     $oldDb,
                     $oldTable,
-                    $_REQUEST['db'],
-                    $_REQUEST['new_name']
+                    $_POST['db'],
+                    $_POST['new_name']
                 );
             }
 
@@ -153,10 +153,10 @@ if (isset($_REQUEST['submitoptions'])) {
         }
     }
 
-    if (! empty($_REQUEST['new_tbl_storage_engine'])
-        && mb_strtoupper($_REQUEST['new_tbl_storage_engine']) !== $tbl_storage_engine
+    if (! empty($_POST['new_tbl_storage_engine'])
+        && mb_strtoupper($_POST['new_tbl_storage_engine']) !== $tbl_storage_engine
     ) {
-        $new_tbl_storage_engine = mb_strtoupper($_REQUEST['new_tbl_storage_engine']);
+        $new_tbl_storage_engine = mb_strtoupper($_POST['new_tbl_storage_engine']);
 
         if ($pma_table->isEngine('ARIA')) {
             $create_options['transactional'] = (isset($create_options['transactional']) && $create_options['transactional'] == '0')
@@ -195,30 +195,30 @@ if (isset($_REQUEST['submitoptions'])) {
         $warning_messages = $operations->getWarningMessagesArray();
     }
 
-    if (isset($_REQUEST['tbl_collation'])
-        && ! empty($_REQUEST['tbl_collation'])
-        && isset($_REQUEST['change_all_collations'])
-        && ! empty($_REQUEST['change_all_collations'])
+    if (isset($_POST['tbl_collation'])
+        && ! empty($_POST['tbl_collation'])
+        && isset($_POST['change_all_collations'])
+        && ! empty($_POST['change_all_collations'])
     ) {
         $operations->changeAllColumnsCollation(
             $GLOBALS['db'],
             $GLOBALS['table'],
-            $_REQUEST['tbl_collation']
+            $_POST['tbl_collation']
         );
     }
 }
 /**
  * Reordering the table has been requested by the user
  */
-if (isset($_REQUEST['submitorderby']) && ! empty($_REQUEST['order_field'])) {
+if (isset($_POST['submitorderby']) && ! empty($_POST['order_field'])) {
     list($sql_query, $result) = $operations->getQueryAndResultForReorderingTable();
 } // end if
 
 /**
  * A partition operation has been requested by the user
  */
-if (isset($_REQUEST['submit_partition'])
-    && ! empty($_REQUEST['partition_operation'])
+if (isset($_POST['submit_partition'])
+    && ! empty($_POST['partition_operation'])
 ) {
     list($sql_query, $result) = $operations->getQueryAndResultForPartition();
 } // end if
diff --git a/tbl_replace.php b/tbl_replace.php
index 40e5f70cbe..5e60bb4fe1 100644
--- a/tbl_replace.php
+++ b/tbl_replace.php
@@ -58,15 +58,15 @@ $insertEdit = new InsertEdit($GLOBALS['dbi']);
 $insertEdit->isInsertRow();
 
 $after_insert_actions = ['new_insert', 'same_insert', 'edit_next'];
-if (isset($_REQUEST['after_insert'])
-    && in_array($_REQUEST['after_insert'], $after_insert_actions)
+if (isset($_POST['after_insert'])
+    && in_array($_POST['after_insert'], $after_insert_actions)
 ) {
-    $url_params['after_insert'] = $_REQUEST['after_insert'];
-    if (isset($_REQUEST['where_clause'])) {
-        foreach ($_REQUEST['where_clause'] as $one_where_clause) {
-            if ($_REQUEST['after_insert'] == 'same_insert') {
+    $url_params['after_insert'] = $_POST['after_insert'];
+    if (isset($_POST['where_clause'])) {
+        foreach ($_POST['where_clause'] as $one_where_clause) {
+            if ($_POST['after_insert'] == 'same_insert') {
                 $url_params['where_clause'][] = $one_where_clause;
-            } elseif ($_REQUEST['after_insert'] == 'edit_next') {
+            } elseif ($_POST['after_insert'] == 'edit_next') {
                 $insertEdit->setSessionForEditNext($one_where_clause);
             }
         }
@@ -147,7 +147,7 @@ $row_skipped = false;
 $unsaved_values = [];
 foreach ($loop_array as $rownumber => $where_clause) {
     // skip fields to be ignored
-    if (! $using_key && isset($_REQUEST['insert_ignore_' . $where_clause])) {
+    if (! $using_key && isset($_POST['insert_ignore_' . $where_clause])) {
         continue;
     }
 
@@ -156,47 +156,47 @@ foreach ($loop_array as $rownumber => $where_clause) {
 
     // Map multi-edit keys to single-level arrays, dependent on how we got the fields
     $multi_edit_columns
-        = isset($_REQUEST['fields']['multi_edit'][$rownumber])
-        ? $_REQUEST['fields']['multi_edit'][$rownumber]
+        = isset($_POST['fields']['multi_edit'][$rownumber])
+        ? $_POST['fields']['multi_edit'][$rownumber]
         : [];
     $multi_edit_columns_name
-        = isset($_REQUEST['fields_name']['multi_edit'][$rownumber])
-        ? $_REQUEST['fields_name']['multi_edit'][$rownumber]
+        = isset($_POST['fields_name']['multi_edit'][$rownumber])
+        ? $_POST['fields_name']['multi_edit'][$rownumber]
         : [];
     $multi_edit_columns_prev
-        = isset($_REQUEST['fields_prev']['multi_edit'][$rownumber])
-        ? $_REQUEST['fields_prev']['multi_edit'][$rownumber]
+        = isset($_POST['fields_prev']['multi_edit'][$rownumber])
+        ? $_POST['fields_prev']['multi_edit'][$rownumber]
         : null;
     $multi_edit_funcs
-        = isset($_REQUEST['funcs']['multi_edit'][$rownumber])
-        ? $_REQUEST['funcs']['multi_edit'][$rownumber]
+        = isset($_POST['funcs']['multi_edit'][$rownumber])
+        ? $_POST['funcs']['multi_edit'][$rownumber]
         : null;
     $multi_edit_salt
-        = isset($_REQUEST['salt']['multi_edit'][$rownumber])
-        ? $_REQUEST['salt']['multi_edit'][$rownumber]
+        = isset($_POST['salt']['multi_edit'][$rownumber])
+        ? $_POST['salt']['multi_edit'][$rownumber]
         : null;
     $multi_edit_columns_type
-        = isset($_REQUEST['fields_type']['multi_edit'][$rownumber])
-        ? $_REQUEST['fields_type']['multi_edit'][$rownumber]
+        = isset($_POST['fields_type']['multi_edit'][$rownumber])
+        ? $_POST['fields_type']['multi_edit'][$rownumber]
         : null;
     $multi_edit_columns_null
-        = isset($_REQUEST['fields_null']['multi_edit'][$rownumber])
-        ? $_REQUEST['fields_null']['multi_edit'][$rownumber]
+        = isset($_POST['fields_null']['multi_edit'][$rownumber])
+        ? $_POST['fields_null']['multi_edit'][$rownumber]
         : null;
     $multi_edit_columns_null_prev
-        = isset($_REQUEST['fields_null_prev']['multi_edit'][$rownumber])
-        ? $_REQUEST['fields_null_prev']['multi_edit'][$rownumber]
+        = isset($_POST['fields_null_prev']['multi_edit'][$rownumber])
+        ? $_POST['fields_null_prev']['multi_edit'][$rownumber]
         : null;
     $multi_edit_auto_increment
-        = isset($_REQUEST['auto_increment']['multi_edit'][$rownumber])
-        ? $_REQUEST['auto_increment']['multi_edit'][$rownumber]
+        = isset($_POST['auto_increment']['multi_edit'][$rownumber])
+        ? $_POST['auto_increment']['multi_edit'][$rownumber]
         : null;
     $multi_edit_virtual
-        = isset($_REQUEST['virtual']['multi_edit'][$rownumber])
-        ? $_REQUEST['virtual']['multi_edit'][$rownumber]
+        = isset($_POST['virtual']['multi_edit'][$rownumber])
+        ? $_POST['virtual']['multi_edit'][$rownumber]
         : null;
 
-    // When a select field is nullified, it's not present in $_REQUEST
+    // When a select field is nullified, it's not present in $_POST
     // so initialize it; this way, the foreach($multi_edit_columns) will process it
     foreach ($multi_edit_columns_name as $key => $val) {
         if (! isset($multi_edit_columns[$key])) {
@@ -227,30 +227,31 @@ foreach ($loop_array as $rownumber => $where_clause) {
             $filename = 'libraries/classes/Plugins/Transformations/'
                 . $mime_map[$column_name]['input_transformation'];
             if (is_file($filename)) {
-                include_once $filename;
                 $classname = $transformations->getClassName($filename);
-                /** @var IOTransformationsPlugin $transformation_plugin */
-                $transformation_plugin = new $classname();
-                $transformation_options = $transformations->getOptions(
-                    $mime_map[$column_name]['input_transformation_options']
-                );
-                $current_value = $transformation_plugin->applyTransformation(
-                    $current_value,
-                    $transformation_options
-                );
-                // check if transformation was successful or not
-                // and accordingly set error messages & insert_fail
-                if (method_exists($transformation_plugin, 'isSuccess')
-                    && !$transformation_plugin->isSuccess()
-                ) {
-                    $insert_fail = true;
-                    $row_skipped = true;
-                    $insert_errors[] = sprintf(
-                        __('Row: %1$s, Column: %2$s, Error: %3$s'),
-                        $rownumber,
-                        $column_name,
-                        $transformation_plugin->getError()
+                if (class_exists($classname)) {
+                    /** @var IOTransformationsPlugin $transformation_plugin */
+                    $transformation_plugin = new $classname();
+                    $transformation_options = $transformations->getOptions(
+                        $mime_map[$column_name]['input_transformation_options']
                     );
+                    $current_value = $transformation_plugin->applyTransformation(
+                        $current_value,
+                        $transformation_options
+                    );
+                    // check if transformation was successful or not
+                    // and accordingly set error messages & insert_fail
+                    if (method_exists($transformation_plugin, 'isSuccess')
+                        && !$transformation_plugin->isSuccess()
+                    ) {
+                        $insert_fail = true;
+                        $row_skipped = true;
+                        $insert_errors[] = sprintf(
+                            __('Row: %1$s, Column: %2$s, Error: %3$s'),
+                            $rownumber,
+                            $column_name,
+                            $transformation_plugin->getError()
+                        );
+                    }
                 }
             }
         }
@@ -324,7 +325,7 @@ foreach ($loop_array as $rownumber => $where_clause) {
             $query[] = 'UPDATE ' . Util::backquote($GLOBALS['table'])
                 . ' SET ' . implode(', ', $query_values)
                 . ' WHERE ' . $where_clause
-                . ($_REQUEST['clause_is_unique'] ? '' : ' LIMIT 1');
+                . ($_POST['clause_is_unique'] ? '' : ' LIMIT 1');
         }
     }
 } // end foreach ($loop_array as $where_clause)
@@ -349,7 +350,7 @@ unset(
 // Builds the sql query
 if ($is_insert && count($value_sets) > 0) {
     $query = $insertEdit->buildSqlQuery($is_insertignore, $query_fields, $value_sets);
-} elseif (empty($query) && ! isset($_REQUEST['preview_sql']) && !$row_skipped) {
+} elseif (empty($query) && ! isset($_POST['preview_sql']) && !$row_skipped) {
     // No change -> move back to the calling script
     //
     // Note: logic passes here for inline edit
@@ -365,7 +366,7 @@ if ($is_insert && count($value_sets) > 0) {
 unset($multi_edit_columns, $is_insertignore);
 
 // If there is a request for SQL previewing.
-if (isset($_REQUEST['preview_sql'])) {
+if (isset($_POST['preview_sql'])) {
     Core::previewSQL($query);
 }
 
@@ -425,11 +426,11 @@ if ($response->isAjax() && ! isset($_POST['ajax_page_request'])) {
      * transformed fields, if they were edited. After that, output the correct
      * link/transformed value and exit
      */
-    if (isset($_REQUEST['rel_fields_list']) && $_REQUEST['rel_fields_list'] != '') {
+    if (isset($_POST['rel_fields_list']) && $_POST['rel_fields_list'] != '') {
         $map = $relation->getForeigners($db, $table, '', 'both');
 
         $relation_fields = [];
-        parse_str($_REQUEST['rel_fields_list'], $relation_fields);
+        parse_str($_POST['rel_fields_list'], $relation_fields);
 
         // loop for each relation cell
         /** @var array $relation_fields */
@@ -453,11 +454,11 @@ if ($response->isAjax() && ! isset($_POST['ajax_page_request'])) {
             }
         }   // end of loop for each relation cell
     }
-    if (isset($_REQUEST['do_transformations'])
-        && $_REQUEST['do_transformations'] == true
+    if (isset($_POST['do_transformations'])
+        && $_POST['do_transformations'] == true
     ) {
         $edited_values = [];
-        parse_str($_REQUEST['transform_fields_list'], $edited_values);
+        parse_str($_POST['transform_fields_list'], $edited_values);
 
         if (! isset($extra_data)) {
             $extra_data = [];
@@ -486,7 +487,7 @@ if ($response->isAjax() && ! isset($_POST['ajax_page_request'])) {
 
     // Need to check the inline edited value can be truncated by MySQL
     // without informing while saving
-    $column_name = $_REQUEST['fields_name']['multi_edit'][0][0];
+    $column_name = $_POST['fields_name']['multi_edit'][0][0];
 
     $insertEdit->verifyWhetherValueCanBeTruncatedAndAppendExtraData(
         $db,
@@ -496,7 +497,7 @@ if ($response->isAjax() && ! isset($_POST['ajax_page_request'])) {
     );
 
     /**Get the total row count of the table*/
-    $_table = new Table($_REQUEST['table'], $_REQUEST['db']);
+    $_table = new Table($_POST['table'], $_POST['db']);
     $extra_data['row_count'] = $_table->countRecords();
 
     $extra_data['sql_query'] = Util::getMessage(
@@ -527,8 +528,8 @@ $active_page = $goto_include;
  * WHERE clause information so that tbl_change.php does not go back
  * to the current record
  */
-if (isset($_REQUEST['after_insert']) && 'new_insert' == $_REQUEST['after_insert']) {
-    unset($_REQUEST['where_clause']);
+if (isset($_POST['after_insert']) && 'new_insert' == $_POST['after_insert']) {
+    unset($_POST['where_clause']);
 }
 
 /**
diff --git a/tbl_row_action.php b/tbl_row_action.php
index ae3b451cf8..ba43cbafef 100644
--- a/tbl_row_action.php
+++ b/tbl_row_action.php
@@ -16,20 +16,20 @@ use PhpMyAdmin\Url;
  */
 require_once 'libraries/common.inc.php';
 
-if (isset($_REQUEST['submit_mult'])) {
-    $submit_mult = $_REQUEST['submit_mult'];
+if (isset($_POST['submit_mult'])) {
+    $submit_mult = $_POST['submit_mult'];
     // workaround for IE problem:
-} elseif (isset($_REQUEST['submit_mult_delete_x'])) {
+} elseif (isset($_POST['submit_mult_delete_x'])) {
     $submit_mult = 'row_delete';
-} elseif (isset($_REQUEST['submit_mult_change_x'])) {
+} elseif (isset($_POST['submit_mult_change_x'])) {
     $submit_mult = 'row_edit';
-} elseif (isset($_REQUEST['submit_mult_export_x'])) {
+} elseif (isset($_POST['submit_mult_export_x'])) {
     $submit_mult = 'row_export';
 }
 
 // If the 'Ask for confirmation' button was pressed, this can only come
 // from 'delete' mode, so we set it straight away.
-if (isset($_REQUEST['mult_btn'])) {
+if (isset($_POST['mult_btn'])) {
     $submit_mult = 'row_delete';
 }
 
@@ -64,9 +64,9 @@ switch ($submit_mult) {
 }
 
 if (!empty($submit_mult)) {
-    if (isset($_REQUEST['goto'])
-        && (! isset($_REQUEST['rows_to_delete'])
-        || ! is_array($_REQUEST['rows_to_delete']))
+    if (isset($_POST['goto'])
+        && (! isset($_POST['rows_to_delete'])
+        || ! is_array($_POST['rows_to_delete']))
     ) {
         $response = Response::getInstance();
         $response->setRequestStatus(false);
@@ -76,7 +76,7 @@ if (!empty($submit_mult)) {
     switch ($submit_mult) {
     /** @noinspection PhpMissingBreakStatementInspection */
         case 'row_copy':
-            $_REQUEST['default_action'] = 'insert';
+            $_POST['default_action'] = 'insert';
             // no break to allow for fallthough
         case 'row_edit':
             // As we got the rows to be edited from the
@@ -84,10 +84,10 @@ if (!empty($submit_mult)) {
             // indicating WHERE clause. Then we build the array which is used
             // for the tbl_change.php script.
             $where_clause = [];
-            if (isset($_REQUEST['rows_to_delete'])
-            && is_array($_REQUEST['rows_to_delete'])
+            if (isset($_POST['rows_to_delete'])
+            && is_array($_POST['rows_to_delete'])
             ) {
-                foreach ($_REQUEST['rows_to_delete'] as $i => $i_where_clause) {
+                foreach ($_POST['rows_to_delete'] as $i => $i_where_clause) {
                     $where_clause[] = $i_where_clause;
                 }
             }
@@ -104,10 +104,10 @@ if (!empty($submit_mult)) {
             // indicating WHERE clause. Then we build the array which is used
             // for the tbl_change.php script.
             $where_clause = [];
-            if (isset($_REQUEST['rows_to_delete'])
-            && is_array($_REQUEST['rows_to_delete'])
+            if (isset($_POST['rows_to_delete'])
+            && is_array($_POST['rows_to_delete'])
             ) {
-                foreach ($_REQUEST['rows_to_delete'] as $i => $i_where_clause) {
+                foreach ($_POST['rows_to_delete'] as $i => $i_where_clause) {
                     $where_clause[] = $i_where_clause;
                 }
             }
@@ -120,7 +120,7 @@ if (!empty($submit_mult)) {
             $action = 'tbl_row_action.php';
             $err_url = 'tbl_row_action.php'
             . Url::getCommon($GLOBALS['url_params']);
-            if (! isset($_REQUEST['mult_btn'])) {
+            if (! isset($_POST['mult_btn'])) {
                 $original_sql_query = $sql_query;
                 if (! empty($url_query)) {
                     $original_url_query = $url_query;
@@ -136,7 +136,7 @@ if (!empty($submit_mult)) {
          * Show result of multi submit operation
          */
             // sql_query is not set when user does not confirm multi-delete
-            if ((! empty($submit_mult) || isset($_REQUEST['mult_btn']))
+            if ((! empty($submit_mult) || isset($_POST['mult_btn']))
             && ! empty($sql_query)
             ) {
                 $disp_message = __('Your SQL query has been executed successfully.');
diff --git a/tbl_sql.php b/tbl_sql.php
index 19751db896..e8d681da1d 100644
--- a/tbl_sql.php
+++ b/tbl_sql.php
@@ -46,8 +46,8 @@ $response->addHTML(
     $sqlQueryForm->getHtml(
         true,
         false,
-        isset($_REQUEST['delimiter'])
-        ? htmlspecialchars($_REQUEST['delimiter'])
+        isset($_POST['delimiter'])
+        ? htmlspecialchars($_POST['delimiter'])
         : ';'
     )
 );
diff --git a/tbl_tracking.php b/tbl_tracking.php
index a798968f0c..d211f75ae7 100644
--- a/tbl_tracking.php
+++ b/tbl_tracking.php
@@ -28,10 +28,10 @@ $tracking = new Tracking();
 
 if (Tracker::isActive()
     && Tracker::isTracked($GLOBALS["db"], $GLOBALS["table"])
-    && ! (isset($_REQUEST['toggle_activation'])
-    && $_REQUEST['toggle_activation'] == 'deactivate_now')
-    && ! (isset($_REQUEST['report_export'])
-    && $_REQUEST['export_type'] == 'sqldumpfile')
+    && ! (isset($_POST['toggle_activation'])
+    && $_POST['toggle_activation'] == 'deactivate_now')
+    && ! (isset($_POST['report_export'])
+    && $_POST['export_type'] == 'sqldumpfile')
 ) {
     $msg = Message::notice(
         sprintf(
@@ -55,46 +55,46 @@ $selection_data     = false;
 $selection_both     = false;
 
 // Init vars for tracking report
-if (isset($_REQUEST['report']) || isset($_REQUEST['report_export'])) {
+if (isset($_POST['report']) || isset($_POST['report_export'])) {
     $data = Tracker::getTrackedData(
-        $_REQUEST['db'],
-        $_REQUEST['table'],
-        $_REQUEST['version']
+        $GLOBALS['db'],
+        $GLOBALS['table'],
+        $_POST['version']
     );
 
 
-    if (! isset($_REQUEST['logtype'])) {
-        $_REQUEST['logtype'] = 'schema_and_data';
+    if (! isset($_POST['logtype'])) {
+        $_POST['logtype'] = 'schema_and_data';
     }
-    if ($_REQUEST['logtype'] == 'schema') {
+    if ($_POST['logtype'] == 'schema') {
         $selection_schema = true;
-    } elseif ($_REQUEST['logtype'] == 'data') {
+    } elseif ($_POST['logtype'] == 'data') {
         $selection_data   = true;
     } else {
         $selection_both   = true;
     }
-    if (! isset($_REQUEST['date_from'])) {
-        $_REQUEST['date_from'] = $data['date_from'];
+    if (! isset($_POST['date_from'])) {
+        $_POST['date_from'] = $data['date_from'];
     }
-    if (! isset($_REQUEST['date_to'])) {
-        $_REQUEST['date_to'] = $data['date_to'];
+    if (! isset($_POST['date_to'])) {
+        $_POST['date_to'] = $data['date_to'];
     }
-    if (! isset($_REQUEST['users'])) {
-        $_REQUEST['users'] = '*';
+    if (! isset($_POST['users'])) {
+        $_POST['users'] = '*';
     }
-    $filter_ts_from = strtotime($_REQUEST['date_from']);
-    $filter_ts_to   = strtotime($_REQUEST['date_to']);
-    $filter_users   = array_map('trim', explode(',', $_REQUEST['users']));
+    $filter_ts_from = strtotime($_POST['date_from']);
+    $filter_ts_to   = strtotime($_POST['date_to']);
+    $filter_users   = array_map('trim', explode(',', $_POST['users']));
 }
 
 // Prepare export
-if (isset($_REQUEST['report_export'])) {
+if (isset($_POST['report_export'])) {
     $entries = $tracking->getEntries($data, $filter_ts_from, $filter_ts_to, $filter_users);
 }
 
 // Export as file download
-if (isset($_REQUEST['report_export'])
-    && $_REQUEST['export_type'] == 'sqldumpfile'
+if (isset($_POST['report_export'])
+    && $_POST['export_type'] == 'sqldumpfile'
 ) {
     $tracking->exportAsFileDownload($entries);
 }
@@ -104,10 +104,10 @@ $html = '<br/>';
 /**
  * Actions
  */
-if (isset($_REQUEST['submit_mult'])) {
-    if (! empty($_REQUEST['selected_versions'])) {
-        if ($_REQUEST['submit_mult'] == 'delete_version') {
-            foreach ($_REQUEST['selected_versions'] as $version) {
+if (isset($_POST['submit_mult'])) {
+    if (! empty($_POST['selected_versions'])) {
+        if ($_POST['submit_mult'] == 'delete_version') {
+            foreach ($_POST['selected_versions'] as $version) {
                 $tracking->deleteTrackingVersion($version);
             }
             $html .= Message::success(
@@ -121,45 +121,45 @@ if (isset($_REQUEST['submit_mult'])) {
     }
 }
 
-if (isset($_REQUEST['submit_delete_version'])) {
-    $html .= $tracking->deleteTrackingVersion($_REQUEST['version']);
+if (isset($_POST['submit_delete_version'])) {
+    $html .= $tracking->deleteTrackingVersion($_POST['version']);
 }
 
 // Create tracking version
-if (isset($_REQUEST['submit_create_version'])) {
+if (isset($_POST['submit_create_version'])) {
     $html .= $tracking->createTrackingVersion();
 }
 
 // Deactivate tracking
-if (isset($_REQUEST['toggle_activation'])
-    && $_REQUEST['toggle_activation'] == 'deactivate_now'
+if (isset($_POST['toggle_activation'])
+    && $_POST['toggle_activation'] == 'deactivate_now'
 ) {
     $html .= $tracking->changeTracking('deactivate');
 }
 
 // Activate tracking
-if (isset($_REQUEST['toggle_activation'])
-    && $_REQUEST['toggle_activation'] == 'activate_now'
+if (isset($_POST['toggle_activation'])
+    && $_POST['toggle_activation'] == 'activate_now'
 ) {
     $html .= $tracking->changeTracking('activate');
 }
 
 // Export as SQL execution
-if (isset($_REQUEST['report_export']) && $_REQUEST['export_type'] == 'execution') {
+if (isset($_POST['report_export']) && $_POST['export_type'] == 'execution') {
     $sql_result = $tracking->exportAsSqlExecution($entries);
     $msg = Message::success(__('SQL statements executed.'));
     $html .= $msg->getDisplay();
 }
 
 // Export as SQL dump
-if (isset($_REQUEST['report_export']) && $_REQUEST['export_type'] == 'sqldump') {
+if (isset($_POST['report_export']) && $_POST['export_type'] == 'sqldump') {
     $html .= $tracking->exportAsSqlDump($entries);
 }
 
 /*
  * Schema snapshot
  */
-if (isset($_REQUEST['snapshot'])) {
+if (isset($_POST['snapshot'])) {
     $html .= $tracking->getHtmlForSchemaSnapshot($url_query);
 }
 // end of snapshot report
@@ -167,13 +167,13 @@ if (isset($_REQUEST['snapshot'])) {
 /*
  *  Tracking report
  */
-if (isset($_REQUEST['report'])
-    && (isset($_REQUEST['delete_ddlog']) || isset($_REQUEST['delete_dmlog']))
+if (isset($_POST['report'])
+    && (isset($_POST['delete_ddlog']) || isset($_POST['delete_dmlog']))
 ) {
     $html .= $tracking->deleteTrackingReportRows($data);
 }
 
-if (isset($_REQUEST['report']) || isset($_REQUEST['report_export'])) {
+if (isset($_POST['report']) || isset($_POST['report_export'])) {
     $html .= $tracking->getHtmlForTrackingReport(
         $url_query,
         $data,
@@ -187,7 +187,6 @@ if (isset($_REQUEST['report']) || isset($_REQUEST['report_export'])) {
     );
 } // end of report
 
-
 /*
  * Main page
  */
diff --git a/templates/database/tracking/tables.twig b/templates/database/tracking/tables.twig
index 43a75c1b38..8aafa81b31 100644
--- a/templates/database/tracking/tables.twig
+++ b/templates/database/tracking/tables.twig
@@ -45,25 +45,47 @@
                                 {{ version.status_button|raw }}
                             </td>
                             <td>
-                                <a class="delete_tracking_anchor ajax"
-                                    href="db_tracking.php{{ url_query|raw }}&amp;table=
-                                    {{- version.table_name }}&amp;delete_tracking=true">
+                                <a class="delete_tracking_anchor ajax" href="db_tracking.php" data-post="
+                                    {{- get_common({
+                                        'db': db,
+                                        'goto': 'tbl_tracking.php',
+                                        'back': 'db_tracking.php',
+                                        'table': version.table_name,
+                                        'delete_tracking': true
+                                    }, '') }}">
                                     {{ get_icon('b_drop', 'Delete tracking'|trans) }}
                                 </a>
                             </td>
                             <td>
-                                <a href="tbl_tracking.php{{ url_query|raw }}&amp;table=
-                                    {{- version.table_name }}">
+                                <a href="tbl_tracking.php" data-post="
+                                    {{- get_common({
+                                        'db': db,
+                                        'goto': 'tbl_tracking.php',
+                                        'back': 'db_tracking.php',
+                                        'table': version.table_name
+                                    }, '') }}">
                                     {{ get_icon('b_versions', 'Versions'|trans) }}
                                 </a>
-                                <a href="tbl_tracking.php{{ url_query|raw }}&amp;table=
-                                    {{- version.table_name }}&amp;report=true&amp;version=
-                                    {{- version.version }}">
+                                <a href="tbl_tracking.php" data-post="
+                                    {{- get_common({
+                                        'db': db,
+                                        'goto': 'tbl_tracking.php',
+                                        'back': 'db_tracking.php',
+                                        'table': version.table_name,
+                                        'report': true,
+                                        'version': version.version
+                                    }, '') }}">
                                     {{ get_icon('b_report', 'Tracking report'|trans) }}
                                 </a>
-                                <a href="tbl_tracking.php{{ url_query|raw }}&amp;table=
-                                    {{- version.table_name }}&amp;snapshot=true&amp;version=
-                                    {{- version.version }}">
+                                <a href="tbl_tracking.php" data-post="
+                                    {{- get_common({
+                                        'db': db,
+                                        'goto': 'tbl_tracking.php',
+                                        'back': 'db_tracking.php',
+                                        'table': version.table_name,
+                                        'snapshot': true,
+                                        'version': version.version
+                                    }, '') }}">
                                     {{ get_icon('b_props', 'Structure snapshot'|trans) }}
                                 </a>
                             </td>
diff --git a/templates/server/binlog/log_selector.twig b/templates/server/binlog/log_selector.twig
index 4750bfe16b..54531be640 100644
--- a/templates/server/binlog/log_selector.twig
+++ b/templates/server/binlog/log_selector.twig
@@ -1,4 +1,4 @@
-<form action="server_binlog.php" method="get">
+<form action="server_binlog.php" method="post">
     {{ get_hidden_inputs(url_params) }}
     <fieldset>
         <legend>
diff --git a/templates/table/search/input_box.twig b/templates/table/search/input_box.twig
index c4efc1b37c..5bd9c4c9a1 100644
--- a/templates/table/search/input_box.twig
+++ b/templates/table/search/input_box.twig
@@ -20,11 +20,10 @@
             {% if criteria_values[column_index] is defined %}
                 value="{{ criteria_values[column_index] }}"
             {% endif %} />
-        <a class="ajax browse_foreign"
-            href="browse_foreigners.php
-                {{- get_common({'db': db, 'table': table}) -}}
-                &amp;field={{ column_name|url_encode }}&amp;fieldkey=
-                {{- column_index }}&amp;fromsearch=1">
+        <a class="ajax browse_foreign" href="browse_foreigners.php" data-post="
+            {{- get_common({'db': db, 'table': table}, '') -}}
+            &amp;field={{ column_name|url_encode }}&amp;fieldkey=
+            {{- column_index }}&amp;fromsearch=1">
             {{ titles['Browse']|replace({"'": "\\'"})|raw }}
         </a>
     {% endif %}
diff --git a/templates/table/tracking/main.twig b/templates/table/tracking/main.twig
index c0aadb1ae3..0bfa74ca24 100644
--- a/templates/table/tracking/main.twig
+++ b/templates/table/tracking/main.twig
@@ -56,23 +56,27 @@
                             <td>{% trans 'not active' %}</td>
                         {% endif %}
                         <td>
-                            <a class="delete_version_anchor ajax" href="tbl_tracking.php{{- url_query|raw -}}&version=
-                                {{- version['version']|escape -}}&submit_delete_version=true">
+                            <a class="delete_version_anchor ajax" href="tbl_tracking.php" data-post="
+                                {{- get_common(url_params|merge({
+                                    'version': version['version'],
+                                    'submit_delete_version': true
+                                }), '') }}">
                                 {{ get_icon('b_drop', 'Delete version'|trans) }}
                             </a>
                         </td>
                         <td>
-                            <a href="tbl_tracking.php
-                                {{- get_common(
-                                    url_params|merge({'report': 'true', 'version': version['version']})
-                                ) -}}">
+                            <a href="tbl_tracking.php" data-post="
+                                {{- get_common(url_params|merge({
+                                    'version': version['version'],
+                                    'report': 'true'
+                                }), '') }}">
                                 {{ get_icon('b_report', 'Tracking report'|trans) }}
                             </a>
-                            &nbsp;&nbsp;
-                            <a href="tbl_tracking.php
-                                {{- get_common(
-                                    url_params|merge({'snapshot': 'true', 'version': version['version']})
-                                ) -}}">
+                            <a href="tbl_tracking.php" data-post="
+                                {{- get_common(url_params|merge({
+                                    'version': version['version'],
+                                    'snapshot': 'true'
+                                }), '') }}">
                                 {{ get_icon('b_props', 'Structure snapshot'|trans) }}
                             </a>
                         </td>
diff --git a/templates/table/tracking/report_table.twig b/templates/table/tracking/report_table.twig
index 525e35cc71..fe00526676 100644
--- a/templates/table/tracking/report_table.twig
+++ b/templates/table/tracking/report_table.twig
@@ -16,7 +16,7 @@
                 <td><small>{{ entry.username }}</small></td>
                 <td>{{ entry.formated_statement|raw }}</td>
                 <td class="nowrap">
-                    <a class="delete_entry_anchor ajax" href="tbl_tracking.php
+                    <a class="delete_entry_anchor ajax" href="tbl_tracking.php" data-post="
                         {{- entry.url_params|raw }}">
                         {{ drop_image_or_text|raw }}
                     </a>
diff --git a/test/classes/BrowseForeignersTest.php b/test/classes/BrowseForeignersTest.php
index 6b3130acca..1d0a47a24a 100644
--- a/test/classes/BrowseForeignersTest.php
+++ b/test/classes/BrowseForeignersTest.php
@@ -68,7 +68,7 @@ class BrowseForeignersTest extends TestCase
             $this->browseForeigners->getForeignLimit(null)
         );
 
-        $_REQUEST['pos'] = 10;
+        $_POST['pos'] = 10;
 
         $this->assertEquals(
             'LIMIT 10, 25 ',
@@ -109,7 +109,7 @@ class BrowseForeignersTest extends TestCase
             )
         );
 
-        $_REQUEST['pos'] = 15;
+        $_POST['pos'] = 15;
         $foreignData = [];
         $foreignData['disp_row'] = [];
         $foreignData['the_total'] = 5;
@@ -198,8 +198,8 @@ class BrowseForeignersTest extends TestCase
         $foreignData['disp_row'] = '';
         $fieldkey = 'bar';
         $current_value = '';
-        $_REQUEST['rownumber'] = 1;
-        $_REQUEST['foreign_filter'] = '5';
+        $_POST['rownumber'] = 1;
+        $_POST['foreign_filter'] = '5';
         $result = $this->browseForeigners->getHtmlForRelationalFieldSelection(
             $db,
             $table,
diff --git a/test/classes/CentralColumnsTest.php b/test/classes/CentralColumnsTest.php
index de4c1d5326..4e994dc46c 100644
--- a/test/classes/CentralColumnsTest.php
+++ b/test/classes/CentralColumnsTest.php
@@ -231,8 +231,8 @@ class CentralColumnsTest extends TestCase
      */
     public function testSyncUniqueColumns()
     {
-        $_REQUEST['db'] = 'PMA_db';
-        $_REQUEST['table'] = 'PMA_table';
+        $_POST['db'] = 'PMA_db';
+        $_POST['table'] = 'PMA_table';
 
         $this->assertTrue(
             $this->centralColumns->syncUniqueColumns(
@@ -248,8 +248,8 @@ class CentralColumnsTest extends TestCase
      */
     public function testDeleteColumnsFromList()
     {
-        $_REQUEST['db'] = 'PMA_db';
-        $_REQUEST['table'] = 'PMA_table';
+        $_POST['db'] = 'PMA_db';
+        $_POST['table'] = 'PMA_table';
 
         // when column exists in the central column list
         $GLOBALS['dbi']->expects($this->at(4))
diff --git a/test/classes/Controllers/Server/ServerBinlogControllerTest.php b/test/classes/Controllers/Server/ServerBinlogControllerTest.php
index 422e731f4f..1ce2652ec2 100644
--- a/test/classes/Controllers/Server/ServerBinlogControllerTest.php
+++ b/test/classes/Controllers/Server/ServerBinlogControllerTest.php
@@ -31,9 +31,9 @@ class ServerBinlogControllerTest extends PmaTestCase
      */
     protected function setUp()
     {
-        //$_REQUEST
-        $_REQUEST['log'] = "index1";
-        $_REQUEST['pos'] = 3;
+        //$_POST
+        $_POST['log'] = "index1";
+        $_POST['pos'] = 3;
 
         //$GLOBALS
         $GLOBALS['cfg']['MaxRows'] = 10;
@@ -195,7 +195,7 @@ class ServerBinlogControllerTest extends PmaTestCase
             $html
         );
         //validate 4: PMA_getNavigationRow is right
-        $urlNavigation = 'server_binlog.php?log=log&amp;dontlimitchars=1&amp;'
+        $urlNavigation = 'server_binlog.php" data-post="log=log&amp;dontlimitchars=1&amp;'
             . 'pos=3&amp;server=1&amp';
         $this->assertContains(
             $urlNavigation,
diff --git a/test/classes/Controllers/Table/TableIndexesControllerTest.php b/test/classes/Controllers/Table/TableIndexesControllerTest.php
index b6dcc4ca0b..42ba809d73 100644
--- a/test/classes/Controllers/Table/TableIndexesControllerTest.php
+++ b/test/classes/Controllers/Table/TableIndexesControllerTest.php
@@ -113,7 +113,7 @@ class TableIndexesControllerTest extends PmaTestCase
         );
 
         // Preview SQL
-        $_REQUEST['preview_sql'] = true;
+        $_POST['preview_sql'] = true;
         $ctrl->doSaveDataAction();
         $jsonArray = $response->getJSONResult();
         $this->assertArrayHasKey('sql_data', $jsonArray);
@@ -125,7 +125,7 @@ class TableIndexesControllerTest extends PmaTestCase
         // Alter success
         $response->clear();
         Response::getInstance()->setAjax(true);
-        unset($_REQUEST['preview_sql']);
+        unset($_POST['preview_sql']);
         $ctrl->doSaveDataAction();
         $jsonArray = $response->getJSONResult();
         $this->assertArrayHasKey('index_table', $jsonArray);
@@ -171,8 +171,8 @@ class TableIndexesControllerTest extends PmaTestCase
             $index
         );
 
-        $_REQUEST['create_index'] = true;
-        $_REQUEST['added_fields'] = 3;
+        $_POST['create_index'] = true;
+        $_POST['added_fields'] = 3;
         $ctrl->displayFormAction();
         $html = $response->getHTMLResult();
 
diff --git a/test/classes/Controllers/Table/TableRelationControllerTest.php b/test/classes/Controllers/Table/TableRelationControllerTest.php
index 64f97b3af4..d929327c6d 100644
--- a/test/classes/Controllers/Table/TableRelationControllerTest.php
+++ b/test/classes/Controllers/Table/TableRelationControllerTest.php
@@ -38,8 +38,8 @@ class TableRelationControllerTest extends PmaTestCase
         $GLOBALS['PMA_PHP_SELF'] = 'index.php';
         //$_SESSION
 
-        $_REQUEST['foreignDb'] = 'db';
-        $_REQUEST['foreignTable'] = 'table';
+        $_POST['foreignDb'] = 'db';
+        $_POST['foreignTable'] = 'table';
 
         $GLOBALS['dblist'] = new \stdClass();
         $GLOBALS['dblist']->databases = new class
@@ -214,7 +214,7 @@ class TableRelationControllerTest extends PmaTestCase
             ['tbl_storage_engine' => 'INNODB']
         );
 
-        $_REQUEST['foreign'] = 'true';
+        $_POST['foreign'] = 'true';
         $ctrl->getDropdownValueForDbAction();
         $json = $this->_response->getJSONResult();
         $this->assertEquals(
@@ -260,7 +260,7 @@ class TableRelationControllerTest extends PmaTestCase
             ['tbl_storage_engine' => 'INNODB',]
         );
 
-        $_REQUEST['foreign'] = 'false';
+        $_POST['foreign'] = 'false';
         $ctrl->getDropdownValueForDbAction();
         $json = $this->_response->getJSONResult();
         $this->assertEquals(
diff --git a/test/classes/Controllers/Table/TableSearchControllerTest.php b/test/classes/Controllers/Table/TableSearchControllerTest.php
index 9fca823962..bde3620143 100644
--- a/test/classes/Controllers/Table/TableSearchControllerTest.php
+++ b/test/classes/Controllers/Table/TableSearchControllerTest.php
@@ -390,9 +390,9 @@ class TableSearchControllerTest extends PmaTestCase
         );
         $ctrl = $container->get('TableSearchController');
 
-        $_REQUEST['db'] = 'PMA';
-        $_REQUEST['table'] = 'PMA_BookMark';
-        $_REQUEST['where_clause'] = '`col1` = 1';
+        $_POST['db'] = 'PMA';
+        $_POST['table'] = 'PMA_BookMark';
+        $_POST['where_clause'] = '`col1` = 1';
         $expected = [
             'col1' => 1,
             'col2' => 2
diff --git a/test/classes/Controllers/Table/TableStructureControllerTest.php b/test/classes/Controllers/Table/TableStructureControllerTest.php
index b2824e575a..edfeab3033 100644
--- a/test/classes/Controllers/Table/TableStructureControllerTest.php
+++ b/test/classes/Controllers/Table/TableStructureControllerTest.php
@@ -38,11 +38,6 @@ class TableStructureControllerTest extends PmaTestCase
      */
     protected function setUp()
     {
-        //$_REQUEST
-        $_REQUEST['log'] = "index1";
-        $_REQUEST['pos'] = 3;
-
-        //$GLOBALS
         $GLOBALS['server'] = 1;
         $GLOBALS['db'] = 'db';
         $GLOBALS['table'] = 'table';
@@ -205,31 +200,31 @@ class TableStructureControllerTest extends PmaTestCase
             $method->invoke($ctrl)
         );
 
-        $_REQUEST['submit_mult_drop_x'] = true;
+        $_POST['submit_mult_drop_x'] = true;
         $this->assertEquals(
             'drop',
             $method->invoke($ctrl)
         );
-        unset($_REQUEST['submit_mult_drop_x']);
+        unset($_POST['submit_mult_drop_x']);
 
-        $_REQUEST['submit_mult'] = 'create';
+        $_POST['submit_mult'] = 'create';
         $this->assertEquals(
             'create',
             $method->invoke($ctrl)
         );
-        unset($_REQUEST['submit_mult']);
+        unset($_POST['submit_mult']);
 
-        $_REQUEST['mult_btn'] = __('Yes');
+        $_POST['mult_btn'] = __('Yes');
         $this->assertEquals(
             'row_delete',
             $method->invoke($ctrl)
         );
 
-        $_REQUEST['selected'] = ['a', 'b'];
+        $_POST['selected'] = ['a', 'b'];
         $method->invoke($ctrl);
         $this->assertEquals(
-            $_REQUEST['selected'],
-            $_REQUEST['selected_fld']
+            $_POST['selected'],
+            $_POST['selected_fld']
         );
     }
 
diff --git a/test/classes/CreateAddFieldTest.php b/test/classes/CreateAddFieldTest.php
index bcb7c718ab..9406a67d34 100644
--- a/test/classes/CreateAddFieldTest.php
+++ b/test/classes/CreateAddFieldTest.php
@@ -46,7 +46,7 @@ class CreateAddFieldTest extends TestCase
      */
     public function testGetPartitionsDefinition($expected, $request)
     {
-        $_REQUEST = $request;
+        $_POST = $request;
         $actual = $this->createAddField->getPartitionsDefinition();
         $this->assertEquals($expected, $actual);
     }
@@ -82,7 +82,7 @@ class CreateAddFieldTest extends TestCase
      */
     public function testGetTableCreationQuery($expected, $db, $table, $request)
     {
-        $_REQUEST = $request;
+        $_POST = $request;
         $actual = $this->createAddField->getTableCreationQuery($db, $table);
         $this->assertEquals($expected, $actual);
     }
@@ -118,7 +118,7 @@ class CreateAddFieldTest extends TestCase
      */
     public function testGetNumberOfFieldsFromRequest($expected, $request)
     {
-        $_REQUEST = $request;
+        $_POST = $request;
         $actual = $this->createAddField->getNumberOfFieldsFromRequest();
         $this->assertEquals($expected, $actual);
     }
diff --git a/test/classes/Database/SearchTest.php b/test/classes/Database/SearchTest.php
index bcc511eee4..3397eab612 100644
--- a/test/classes/Database/SearchTest.php
+++ b/test/classes/Database/SearchTest.php
@@ -98,8 +98,8 @@ class SearchTest extends PmaTestCase
      */
     public function testGetWhereClause($type, $expected)
     {
-        $_REQUEST['criteriaSearchType'] = $type;
-        $_REQUEST['criteriaSearchString'] = 'search string';
+        $_POST['criteriaSearchType'] = $type;
+        $_POST['criteriaSearchString'] = 'search string';
 
         $this->object = new Search($GLOBALS['dbi'], 'pma_test');
         $this->assertEquals(
diff --git a/test/classes/ErrorReportTest.php b/test/classes/ErrorReportTest.php
index 6a0bf6381a..4b11f94988 100644
--- a/test/classes/ErrorReportTest.php
+++ b/test/classes/ErrorReportTest.php
@@ -146,14 +146,14 @@ class ErrorReportTest extends TestCase
      */
     public function testGetForm(): void
     {
-        $_REQUEST['exception'] = [];
+        $_POST['exception'] = [];
 
         $form = $this->errorReport->getForm();
         $this->assertContains('<pre class="report-data">[]</pre>', $form);
 
-        $_REQUEST['exception'] = ['stack' => [], 'url' => 'http://localhost/index.php'];
-        $_REQUEST['microhistory'] = '';
-        $_REQUEST['description'] = 'description';
+        $_POST['exception'] = ['stack' => [], 'url' => 'http://localhost/index.php'];
+        $_POST['microhistory'] = '';
+        $_POST['description'] = 'description';
 
         $report = [
             'pma_version' => PMA_VERSION,
@@ -168,8 +168,8 @@ class ErrorReportTest extends TestCase
             'exception_type' => 'js',
             'exception' => ['stack' => [], 'uri' => 'index.php?'],
             'script_name' => 'index.php',
-            'microhistory' => $_REQUEST['microhistory'],
-            'steps' => $_REQUEST['description'],
+            'microhistory' => $_POST['microhistory'],
+            'steps' => $_POST['description'],
         ];
         $expectedData = json_encode($report, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
 
diff --git a/test/classes/InsertEditTest.php b/test/classes/InsertEditTest.php
index 58f964722b..2dd0ea2566 100644
--- a/test/classes/InsertEditTest.php
+++ b/test/classes/InsertEditTest.php
@@ -99,7 +99,7 @@ class InsertEditTest extends TestCase
     public function testGetFormParametersForInsertForm()
     {
         $where_clause = ['foo' => 'bar ', '1' => ' test'];
-        $_REQUEST['clause_is_unique'] = false;
+        $_POST['clause_is_unique'] = false;
         $_POST['sql_query'] = 'SELECT a';
         $GLOBALS['goto'] = 'index.php';
 
@@ -329,7 +329,7 @@ class InsertEditTest extends TestCase
         $result = $this->insertEdit->showTypeOrFunction('function', $url_params, false);
 
         $this->assertEquals(
-            ' : <a href="tbl_change.php?ShowFunctionFields=1&amp;ShowFieldTypesIn'
+            ' : <a href="tbl_change.php" data-post="ShowFunctionFields=1&amp;ShowFieldTypesIn'
             . 'DataEditView=1&amp;goto=sql.php&amp;lang=en">'
             . 'Function</a>',
             $result
@@ -339,7 +339,7 @@ class InsertEditTest extends TestCase
         $result = $this->insertEdit->showTypeOrFunction('function', $url_params, true);
 
         $this->assertEquals(
-            '<th><a href="tbl_change.php?ShowFunctionFields=0&amp;ShowFieldTypesIn'
+            '<th><a href="tbl_change.php" data-post="ShowFunctionFields=0&amp;ShowFieldTypesIn'
             . 'DataEditView=1&amp;goto=sql.php&amp;lang=en" title='
             . '"Hide">Function</a></th>',
             $result
@@ -349,7 +349,7 @@ class InsertEditTest extends TestCase
         $result = $this->insertEdit->showTypeOrFunction('type', $url_params, false);
 
         $this->assertEquals(
-            ' : <a href="tbl_change.php?ShowFunctionFields=1&amp;ShowFieldTypesIn'
+            ' : <a href="tbl_change.php" data-post="ShowFunctionFields=1&amp;ShowFieldTypesIn'
             . 'DataEditView=1&amp;goto=sql.php&amp;lang=en">'
             . 'Type</a>',
             $result
@@ -359,7 +359,7 @@ class InsertEditTest extends TestCase
         $result = $this->insertEdit->showTypeOrFunction('type', $url_params, true);
 
         $this->assertEquals(
-            '<th><a href="tbl_change.php?ShowFunctionFields=1&amp;ShowFieldTypesIn'
+            '<th><a href="tbl_change.php" data-post="ShowFunctionFields=1&amp;ShowFieldTypesIn'
             . 'DataEditView=0&amp;goto=sql.php&amp;lang=en" title='
             . '"Hide">Type</a></th>',
             $result
@@ -805,7 +805,7 @@ class InsertEditTest extends TestCase
 
         $this->assertContains(
             '<a class="ajax browse_foreign" href="browse_'
-            . 'foreigners.php?db=db&amp;table=tbl&amp;field=f&amp;rownumber=8'
+            . 'foreigners.php" data-post="db=db&amp;table=tbl&amp;field=f&amp;rownumber=8'
             . '&amp;data=abc&amp;server=1&amp;lang=en">',
             $result
         );
@@ -1547,7 +1547,7 @@ class InsertEditTest extends TestCase
         $GLOBALS['cfg']['InsertRows'] = 1;
         $GLOBALS['cfg']['ServerDefault'] = 1;
         $GLOBALS['goto'] = "index.php";
-        $_REQUEST['where_clause'] = true;
+        $_POST['where_clause'] = true;
         $_POST['sql_query'] = "SELECT 1";
 
         $result = $this->insertEdit->getContinueInsertionForm(
@@ -1718,12 +1718,12 @@ class InsertEditTest extends TestCase
         ]);
 
         $this->assertContains(
-            'tbl_change.php?ShowFunctionFields=1&amp;ShowFieldTypesInDataEditView=0',
+            'tbl_change.php" data-post="ShowFunctionFields=1&amp;ShowFieldTypesInDataEditView=0',
             $result
         );
 
         $this->assertContains(
-            'tbl_change.php?ShowFunctionFields=0&amp;ShowFieldTypesInDataEditView=1',
+            'tbl_change.php" data-post="ShowFunctionFields=0&amp;ShowFieldTypesInDataEditView=1',
             $result
         );
     }
@@ -1738,7 +1738,7 @@ class InsertEditTest extends TestCase
         $column = $current_row = $extracted_columnspec = [];
         $column['Field'] = 'f';
         $current_row['f'] = null;
-        $_REQUEST['default_action'] = 'insert';
+        $_POST['default_action'] = 'insert';
         $column['Key'] = 'PRI';
         $column['Extra'] = 'fooauto_increment';
 
@@ -1758,7 +1758,7 @@ class InsertEditTest extends TestCase
         );
 
         // Case 2 (bit)
-        unset($_REQUEST['default_action']);
+        unset($_POST['default_action']);
 
         $current_row['f'] = "123";
         $extracted_columnspec['spec_in_brackets'] = 20;
@@ -1924,8 +1924,8 @@ class InsertEditTest extends TestCase
      */
     public function testGetParamsForUpdateOrInsert()
     {
-        $_REQUEST['where_clause'] = 'LIMIT 1';
-        $_REQUEST['submit_type'] = 'showinsert';
+        $_POST['where_clause'] = 'LIMIT 1';
+        $_POST['submit_type'] = 'showinsert';
 
         $result = $this->insertEdit->getParamsForUpdateOrInsert();
 
@@ -1940,8 +1940,8 @@ class InsertEditTest extends TestCase
         );
 
         // case 2 (else)
-        unset($_REQUEST['where_clause']);
-        $_REQUEST['fields']['multi_edit'] = ['a' => 'b', 'c' => 'd'];
+        unset($_POST['where_clause']);
+        $_POST['fields']['multi_edit'] = ['a' => 'b', 'c' => 'd'];
         $result = $this->insertEdit->getParamsForUpdateOrInsert();
 
         $this->assertEquals(
@@ -1962,7 +1962,7 @@ class InsertEditTest extends TestCase
      */
     public function testIsInsertRow()
     {
-        $_REQUEST['insert_rows'] = 5;
+        $_POST['insert_rows'] = 5;
         $GLOBALS['cfg']['InsertRows'] = 2;
 
         $scriptsMock = $this->getMockBuilder('PhpMyAdmin\Scripts')
@@ -2084,7 +2084,7 @@ class InsertEditTest extends TestCase
             $GLOBALS['table']
         );
 
-        $_REQUEST['after_insert'] = 'new_insert';
+        $_POST['after_insert'] = 'new_insert';
         $this->assertEquals(
             'tbl_change.php',
             $this->insertEdit->getGotoInclude('index')
@@ -2104,7 +2104,7 @@ class InsertEditTest extends TestCase
             $this->insertEdit->getErrorUrl([])
         );
 
-        $_REQUEST['err_url'] = 'localhost';
+        $_POST['err_url'] = 'localhost';
         $this->assertEquals(
             'localhost',
             $this->insertEdit->getErrorUrl([])
@@ -2144,7 +2144,7 @@ class InsertEditTest extends TestCase
         $query = ['SELECT 1', 'SELECT 2'];
         $GLOBALS['sql_query'] = 'SELECT';
         $GLOBALS['cfg']['IgnoreMultiSubmitErrors'] = false;
-        $_REQUEST['submit_type'] = '';
+        $_POST['submit_type'] = '';
 
         $dbi = $this->getMockBuilder('PhpMyAdmin\DatabaseInterface')
             ->disableOriginalConstructor()
@@ -2231,7 +2231,7 @@ class InsertEditTest extends TestCase
         $query = ['SELECT 1', 'SELECT 2'];
         $GLOBALS['sql_query'] = 'SELECT';
         $GLOBALS['cfg']['IgnoreMultiSubmitErrors'] = true;
-        $_REQUEST['submit_type'] = '';
+        $_POST['submit_type'] = '';
 
         $dbi = $this->getMockBuilder('PhpMyAdmin\DatabaseInterface')
             ->disableOriginalConstructor()
@@ -2432,7 +2432,7 @@ class InsertEditTest extends TestCase
         ];
         $GLOBALS['cfg']['DefaultTransformations']['PreApPend'] = ['', ''];
         $GLOBALS['cfg']['ServerDefault'] = 1;
-        $_REQUEST['where_clause'] = 1;
+        $_POST['where_clause'] = 1;
         $transformation = [
             'transformation_options' => "'','option ,, quoted',abd"
         ];
@@ -2744,7 +2744,7 @@ class InsertEditTest extends TestCase
         );
 
         // case 4
-        $_REQUEST['fields']['multi_edit'][0][0] = [];
+        $_POST['fields']['multi_edit'][0][0] = [];
         $result = $this->insertEdit->getCurrentValueForDifferentTypes(
             false,
             '0',
@@ -2860,7 +2860,7 @@ class InsertEditTest extends TestCase
         );
 
         // case 8
-        $_REQUEST['fields']['multi_edit'][0][0] = [];
+        $_POST['fields']['multi_edit'][0][0] = [];
         $result = $this->insertEdit->getCurrentValueForDifferentTypes(
             false,
             '0',
@@ -2915,7 +2915,8 @@ class InsertEditTest extends TestCase
     public function testVerifyWhetherValueCanBeTruncatedAndAppendExtraData()
     {
         $extra_data = ['isNeedToRecheck' => true];
-        $_REQUEST['where_clause'][0] = 1;
+        $meta = new stdClass();
+        $_POST['where_clause'][0] = 1;
 
         $dbi = $this->getMockBuilder('PhpMyAdmin\DatabaseInterface')
             ->disableOriginalConstructor()
@@ -3052,14 +3053,14 @@ class InsertEditTest extends TestCase
             ->getMock();
 
         $GLOBALS['dbi'] = $dbi;
-        $_REQUEST['where_clause'] = '1';
+        $_POST['where_clause'] = '1';
         $_SESSION['edit_next'] = '1';
-        $_REQUEST['ShowFunctionFields'] = true;
-        $_REQUEST['ShowFieldTypesInDataEditView'] = true;
-        $_REQUEST['after_insert'] = 'edit_next';
+        $_POST['ShowFunctionFields'] = true;
+        $_POST['ShowFieldTypesInDataEditView'] = true;
+        $_POST['after_insert'] = 'edit_next';
         $GLOBALS['cfg']['InsertRows'] = 2;
         $GLOBALS['cfg']['ShowSQL'] = false;
-        $_REQUEST['default_action'] = 'insert';
+        $_POST['default_action'] = 'insert';
 
         $responseMock = $this->getMockBuilder('PhpMyAdmin\Response')
             ->disableOriginalConstructor()
@@ -3090,9 +3091,9 @@ class InsertEditTest extends TestCase
         );
 
         // case 2
-        unset($_REQUEST['where_clause']);
+        unset($_POST['where_clause']);
         unset($_SESSION['edit_next']);
-        $_REQUEST['default_action'] = '';
+        $_POST['default_action'] = '';
 
         $result = $this->insertEdit->determineInsertOrEdit(null, 'db', 'table');
 
diff --git a/test/classes/Navigation/NavigationTest.php b/test/classes/Navigation/NavigationTest.php
index 43a9b8e893..9e90cd2959 100644
--- a/test/classes/Navigation/NavigationTest.php
+++ b/test/classes/Navigation/NavigationTest.php
@@ -157,7 +157,7 @@ class NavigationTest extends PmaTestCase
             $html
         );
         $this->assertContains(
-            '<a href="navigation.php?'
+            '<a href="navigation.php" data-post="'
             . 'unhideNavItem=1&amp;itemType=table&amp;'
             . 'itemName=tableName&amp;dbName=db&amp;lang=en"'
             . ' class="unhideNavItem ajax">',
diff --git a/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php b/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php
index fd8648b23a..84d2c45217 100644
--- a/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php
+++ b/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php
@@ -82,7 +82,7 @@ class NodeDatabaseChildTest extends PmaTestCase
             $html
         );
         $this->assertContains(
-            '<a href="navigation.php?'
+            '<a href="navigation.php" data-post="'
             . 'hideNavItem=1&amp;itemType=itemType&amp;itemName=child'
             . '&amp;dbName=parent&amp;lang=en" class="hideNavItem ajax">',
             $html
diff --git a/test/classes/NormalizationTest.php b/test/classes/NormalizationTest.php
index 37b4a3d9ee..0fdcfbbfa5 100644
--- a/test/classes/NormalizationTest.php
+++ b/test/classes/NormalizationTest.php
@@ -43,7 +43,7 @@ class NormalizationTest extends TestCase
         $GLOBALS['table'] = 'PMA_table';
         $GLOBALS['server'] = 1;
         $GLOBALS['cfg']['Server']['DisableIS'] = false;
-        $_REQUEST['change_column'] = null;
+        $_POST['change_column'] = null;
 
         //$_SESSION
 
diff --git a/test/classes/OperationsTest.php b/test/classes/OperationsTest.php
index c7430af262..44d819f437 100644
--- a/test/classes/OperationsTest.php
+++ b/test/classes/OperationsTest.php
@@ -79,8 +79,8 @@ class OperationsTest extends TestCase
     public function testGetHtmlForRenameDatabase()
     {
 
-        $_REQUEST['db_collation'] = 'db1';
-        $html = $this->operations->getHtmlForRenameDatabase("pma");
+        $db_collation = 'db1';
+        $html = $this->operations->getHtmlForRenameDatabase("pma", $db_collation);
         $this->assertContains('db_operations.php', $html);
         $this->assertRegExp(
             '/.*db_rename.*Rename database to.*/',
@@ -109,8 +109,8 @@ class OperationsTest extends TestCase
      */
     public function testGetHtmlForCopyDatabase()
     {
-        $_REQUEST['db_collation'] = 'db1';
-        $html = $this->operations->getHtmlForCopyDatabase("pma");
+        $db_collation = 'db1';
+        $html = $this->operations->getHtmlForCopyDatabase("pma", $db_collation);
         $this->assertRegExp('/.*db_operations.php.*/', $html);
         $this->assertRegExp('/.*db_copy.*/', $html);
         $this->assertRegExp('/.*Copy database to.*/', $html);
@@ -124,8 +124,8 @@ class OperationsTest extends TestCase
     public function testGetHtmlForChangeDatabaseCharset()
     {
 
-        $_REQUEST['db_collation'] = 'db1';
-        $result = $this->operations->getHtmlForChangeDatabaseCharset("pma", "bookmark");
+        $db_collation = 'db1';
+        $result = $this->operations->getHtmlForChangeDatabaseCharset("pma", $db_collation);
         $this->assertRegExp(
             '/.*select_db_collation.*Collation.*/m',
             $result
diff --git a/test/classes/ReplicationGuiTest.php b/test/classes/ReplicationGuiTest.php
index f0717e9c2d..59a1b03348 100644
--- a/test/classes/ReplicationGuiTest.php
+++ b/test/classes/ReplicationGuiTest.php
@@ -42,10 +42,8 @@ class ReplicationGuiTest extends TestCase
      */
     protected function setUp()
     {
-        //$_REQUEST
-        $_REQUEST['log'] = "index1";
-        $_REQUEST['pos'] = 3;
-        $_REQUEST['mr_adduser'] = "mr_adduser";
+        //$_POST
+        $_POST['mr_adduser'] = "mr_adduser";
 
         //$GLOBALS
         $GLOBALS['cfg']['MaxRows'] = 10;
diff --git a/test/classes/Rte/EventsTest.php b/test/classes/Rte/EventsTest.php
index dd7de6d545..870c3c2121 100644
--- a/test/classes/Rte/EventsTest.php
+++ b/test/classes/Rte/EventsTest.php
@@ -77,12 +77,12 @@ class EventsTest extends TestCase
      */
     public function testGetDataFromRequestEmpty($in, $out)
     {
-        global $_REQUEST;
+        global $_POST;
 
-        unset($_REQUEST);
+        unset($_POST);
         foreach ($in as $key => $value) {
             if ($value !== '') {
-                $_REQUEST[$key] = $value;
+                $_POST[$key] = $value;
             }
         }
         $this->assertEquals($out, $this->events->getDataFromRequest());
@@ -413,13 +413,13 @@ class EventsTest extends TestCase
      */
     public function testGetQueryFromRequest($request, $query, $num_err)
     {
-        global $_REQUEST, $errors;
+        global $_POST, $errors;
 
         $errors = [];
         $this->events->setGlobals();
 
-        unset($_REQUEST);
-        $_REQUEST = $request;
+        unset($_POST);
+        $_POST = $request;
 
         $dbi = $this->getMockBuilder('PhpMyAdmin\DatabaseInterface')
             ->disableOriginalConstructor()
diff --git a/test/classes/Rte/RoutinesTest.php b/test/classes/Rte/RoutinesTest.php
index 1db33ec40e..7b817b97ba 100644
--- a/test/classes/Rte/RoutinesTest.php
+++ b/test/classes/Rte/RoutinesTest.php
@@ -71,11 +71,12 @@ class RoutinesTest extends TestCase
      */
     public function testGetDataFromRequest($in, $out)
     {
-        global $_REQUEST;
+        global $_POST;
 
-        unset($_REQUEST);
+        unset($_POST); unset($_REQUEST);
         foreach ($in as $key => $value) {
             if ($value !== '') {
+                $_POST[$key] = $value;
                 $_REQUEST[$key] = $value;
             }
         }
@@ -1109,7 +1110,7 @@ class RoutinesTest extends TestCase
      */
     public function testGetQueryFromRequest($request, $query, $num_err)
     {
-        global $_REQUEST, $errors, $cfg;
+        global $_POST, $errors, $cfg;
 
         $cfg['ShowFunctionFields'] = false;
 
@@ -1136,8 +1137,8 @@ class RoutinesTest extends TestCase
 
         $routines = new Routines($dbi);
 
-        unset($_REQUEST);
-        $_REQUEST = $request;
+        unset($_POST);
+        $_POST = $request;
         $this->assertEquals($query, $routines->getQueryFromRequest());
         $this->assertCount($num_err, $errors);
 
diff --git a/test/classes/Rte/TriggersTest.php b/test/classes/Rte/TriggersTest.php
index 14e8582791..e59ee19fca 100644
--- a/test/classes/Rte/TriggersTest.php
+++ b/test/classes/Rte/TriggersTest.php
@@ -63,12 +63,12 @@ class TriggersTest extends TestCase
      */
     public function testGetDataFromRequestEmpty($in, $out)
     {
-        global $_REQUEST;
+        global $_POST;
 
-        unset($_REQUEST);
+        unset($_POST);
         foreach ($in as $key => $value) {
             if ($value !== '') {
-                $_REQUEST[$key] = $value;
+                $_POST[$key] = $value;
             }
         }
         $this->assertEquals($out, $this->triggers->getDataFromRequest());
@@ -350,17 +350,17 @@ class TriggersTest extends TestCase
         $query,
         $num_err
     ) {
-        global $_REQUEST, $errors;
+        global $_POST, $errors;
 
         $errors = [];
         $this->triggers->setGlobals();
 
-        $_REQUEST['item_definer']    = $definer;
-        $_REQUEST['item_name']       = $name;
-        $_REQUEST['item_timing']     = $timing;
-        $_REQUEST['item_event']      = $event;
-        $_REQUEST['item_table']      = $table;
-        $_REQUEST['item_definition'] = $definition;
+        $_POST['item_definer']    = $definer;
+        $_POST['item_name']       = $name;
+        $_POST['item_timing']     = $timing;
+        $_POST['item_event']      = $event;
+        $_POST['item_table']      = $table;
+        $_POST['item_definition'] = $definition;
         $GLOBALS['server'] = 1;
 
         $this->assertEquals($query, $this->triggers->getQueryFromRequest());
diff --git a/test/classes/Server/PrivilegesTest.php b/test/classes/Server/PrivilegesTest.php
index dd06127625..102a24bb83 100644
--- a/test/classes/Server/PrivilegesTest.php
+++ b/test/classes/Server/PrivilegesTest.php
@@ -47,7 +47,7 @@ class PrivilegesTest extends TestCase
         //$_REQUEST
         $_REQUEST['log'] = "index1";
         $_REQUEST['pos'] = 3;
-        $_REQUEST['initial'] = null;
+        $_GET['initial'] = null;
 
         //$GLOBALS
         $GLOBALS['lang'] = 'en';
@@ -193,8 +193,8 @@ class PrivilegesTest extends TestCase
         );
 
         //pre variable have been defined
-        $_REQUEST['pred_tablename'] = "PMA_pred__tablename";
-        $_REQUEST['pred_dbname'] = ["PMA_pred_dbname"];
+        $_POST['pred_tablename'] = "PMA_pred__tablename";
+        $_POST['pred_dbname'] = ["PMA_pred_dbname"];
         list(
             ,, $dbname, $tablename, $routinename,
             $db_and_table, $dbname_is_wildcard
@@ -531,7 +531,7 @@ class PrivilegesTest extends TestCase
     {
         $username = "pma_username";
         $is_menuswork = true;
-        $_REQUEST['edit_user_group_dialog'] = "edit_user_group_dialog";
+        $_GET['edit_user_group_dialog'] = "edit_user_group_dialog";
 
         /* Assertion 1 */
         $html = $this->serverPrivileges->getHtmlForUserGroupDialog($username, $is_menuswork);
@@ -781,7 +781,7 @@ class PrivilegesTest extends TestCase
      */
     public function testGetDataForChangeOrCopyUser()
     {
-        //$_REQUEST['change_copy'] not set
+        //$_POST['change_copy'] not set
         list($queries, $password) = $this->serverPrivileges->getDataForChangeOrCopyUser();
         $this->assertEquals(
             null,
@@ -792,10 +792,10 @@ class PrivilegesTest extends TestCase
             $queries
         );
 
-        //$_REQUEST['change_copy'] is set
-        $_REQUEST['change_copy'] = true;
-        $_REQUEST['old_username'] = 'PMA_old_username';
-        $_REQUEST['old_hostname'] = 'PMA_old_hostname';
+        //$_POST['change_copy'] is set
+        $_POST['change_copy'] = true;
+        $_POST['old_username'] = 'PMA_old_username';
+        $_POST['old_hostname'] = 'PMA_old_hostname';
         list($queries, $password) = $this->serverPrivileges->getDataForChangeOrCopyUser();
         $this->assertEquals(
             'pma_password',
@@ -805,7 +805,7 @@ class PrivilegesTest extends TestCase
             [],
             $queries
         );
-        unset($_REQUEST['change_copy']);
+        unset($_POST['change_copy']);
     }
 
 
@@ -860,13 +860,13 @@ class PrivilegesTest extends TestCase
         $dbname = 'pma_dbname';
         $username = 'pma_username';
         $hostname = 'pma_hostname';
-        $_REQUEST['adduser_submit'] = true;
+        $_POST['adduser_submit'] = true;
         $_POST['pred_username'] = 'any';
         $_POST['pred_hostname'] = 'localhost';
         $_POST['pred_password'] = 'keep';
-        $_REQUEST['createdb-3'] = true;
-        $_REQUEST['userGroup'] = "username";
-        $_REQUEST['authentication_plugin'] = 'mysql_native_password';
+        $_POST['createdb-3'] = true;
+        $_POST['userGroup'] = "username";
+        $_POST['authentication_plugin'] = 'mysql_native_password';
 
         list(
             $ret_message,,, $sql_query,
@@ -908,13 +908,13 @@ class PrivilegesTest extends TestCase
         $dbname = 'pma_dbname';
         $username = 'pma_username';
         $hostname = 'pma_hostname';
-        $_REQUEST['adduser_submit'] = true;
+        $_POST['adduser_submit'] = true;
         $_POST['pred_username'] = 'any';
         $_POST['pred_hostname'] = 'localhost';
         $_POST['pred_password'] = 'keep';
-        $_REQUEST['createdb-3'] = true;
-        $_REQUEST['userGroup'] = "username";
-        $_REQUEST['authentication_plugin'] = 'mysql_native_password';
+        $_POST['createdb-3'] = true;
+        $_POST['userGroup'] = "username";
+        $_POST['authentication_plugin'] = 'mysql_native_password';
 
         list(
             $ret_message,,, $sql_query,
@@ -955,7 +955,7 @@ class PrivilegesTest extends TestCase
         $hostname = 'pma_hostname';
         $err_url = "error.php";
         $_POST['pma_pw'] = 'pma_pw';
-        $_REQUEST['authentication_plugin'] = 'mysql_native_password';
+        $_POST['authentication_plugin'] = 'mysql_native_password';
 
         $message = $this->serverPrivileges->updatePassword(
             $err_url,
@@ -981,10 +981,10 @@ class PrivilegesTest extends TestCase
         $username = 'pma_username';
         $hostname = 'pma_hostname';
         $tablename = 'pma_tablename';
-        $_REQUEST['adduser_submit'] = true;
+        $_POST['adduser_submit'] = true;
         $_POST['pred_username'] = 'any';
         $_POST['pred_hostname'] = 'localhost';
-        $_REQUEST['createdb-3'] = true;
+        $_POST['createdb-3'] = true;
         $_POST['Grant_priv'] = 'Y';
         $_POST['max_questions'] = 1000;
         list ($message, $sql_query)
@@ -1020,10 +1020,10 @@ class PrivilegesTest extends TestCase
         $username = 'pma_username';
         $hostname = 'pma_hostname';
         $tablename = 'pma_tablename';
-        $_REQUEST['adduser_submit'] = true;
+        $_POST['adduser_submit'] = true;
         $_POST['pred_username'] = 'any';
         $_POST['pred_hostname'] = 'localhost';
-        $_REQUEST['createdb-3'] = true;
+        $_POST['createdb-3'] = true;
         $_POST['Grant_priv'] = 'Y';
         $_POST['max_questions'] = 1000;
         list($sql_query, $message) = $this->serverPrivileges->updatePrivileges(
@@ -1201,7 +1201,7 @@ class PrivilegesTest extends TestCase
         $hostname = "PMA_hostname";
         $password = "pma_password";
         $_POST['pred_password'] = 'keep';
-        $_REQUEST['authentication_plugin'] = 'mysql_native_password';
+        $_POST['authentication_plugin'] = 'mysql_native_password';
         $dbname = "PMA_db";
 
         list($create_user_real, $create_user_show, $real_sql_query, $sql_query)
@@ -1820,7 +1820,8 @@ class PrivilegesTest extends TestCase
                 'tablename' => $tablename,
                 'routinename' => '',
                 'revokeall' => 1,
-            ]
+            ],
+            ''
         );
         $this->assertContains(
             $url_html,
@@ -1863,10 +1864,11 @@ class PrivilegesTest extends TestCase
         $username = "pma_username";
         $hostname = "pma_hostname";
         $GLOBALS['dbname'] = "pma_dbname";
-        $_REQUEST['adduser_submit'] = "adduser_submit";
-        $_REQUEST['change_copy'] = "change_copy";
-        $_REQUEST['validate_username'] = "validate_username";
-        $_REQUEST['username'] = "username";
+        $_POST['adduser_submit'] = "adduser_submit";
+        $_POST['username'] = "username";
+        $_POST['change_copy'] = "change_copy";
+        $_GET['validate_username'] = "validate_username";
+        $_GET['username'] = "username";
         $_POST['update_privs'] = "update_privs";
 
         $extra_data = $this->serverPrivileges->getExtraDataForAjaxBehavior(
@@ -2243,9 +2245,9 @@ class PrivilegesTest extends TestCase
      */
     public function testGetDataForDeleteUsers()
     {
-        $_REQUEST['change_copy'] = "change_copy";
-        $_REQUEST['old_hostname'] = "old_hostname";
-        $_REQUEST['old_username'] = "old_username";
+        $_POST['change_copy'] = "change_copy";
+        $_POST['old_hostname'] = "old_hostname";
+        $_POST['old_username'] = "old_username";
         $_SESSION['relation'][1] = [
             'PMA_VERSION' => PMA_VERSION,
             'bookmarkwork' => false,
@@ -2713,7 +2715,7 @@ class PrivilegesTest extends TestCase
         );
 
         // Test case 2 : all successful queries
-        $_REQUEST['mode'] = 3;
+        $_POST['mode'] = 3;
         $queries = ['foo'];
         $actual = $this->serverPrivileges->deleteUser($queries);
         $this->assertArrayHasKey(0, $actual);
@@ -2728,7 +2730,7 @@ class PrivilegesTest extends TestCase
         );
 
         // Test case 3 : failing queries
-        $_REQUEST['mode'] = 1;
+        $_POST['mode'] = 1;
         $queries = ['bar'];
         $actual = $this->serverPrivileges->deleteUser($queries);
         $this->assertArrayHasKey(0, $actual);
diff --git a/test/classes/Server/Status/MonitorTest.php b/test/classes/Server/Status/MonitorTest.php
index 76b9e7b9f8..5e835fe731 100644
--- a/test/classes/Server/Status/MonitorTest.php
+++ b/test/classes/Server/Status/MonitorTest.php
@@ -40,10 +40,6 @@ class MonitorTest extends TestCase
      */
     protected function setUp()
     {
-        //$_REQUEST
-        $_REQUEST['log'] = "index1";
-        $_REQUEST['pos'] = 3;
-
         //$GLOBALS
         $GLOBALS['cfg']['MaxRows'] = 10;
         $GLOBALS['cfg']['ServerDefault'] = "server";
@@ -288,7 +284,7 @@ class MonitorTest extends TestCase
      */
     public function testPMAGetJsonForLogDataTypeGeneral()
     {
-        $_REQUEST['limitTypes'] = true;
+        $_POST['limitTypes'] = true;
 
         //Mock DBI
         $dbi = $this->getMockBuilder('PhpMyAdmin\DatabaseInterface')
@@ -348,7 +344,7 @@ class MonitorTest extends TestCase
      */
     public function testPMAGetJsonForLoggingVars()
     {
-        $_REQUEST['varName'] = "varName";
+        $_POST['varName'] = "varName";
 
         //Mock DBI
         $dbi = $this->getMockBuilder('PhpMyAdmin\DatabaseInterface')
@@ -383,8 +379,8 @@ class MonitorTest extends TestCase
      */
     public function testPMAGetJsonForQueryAnalyzer()
     {
-        $_REQUEST['database'] = "database";
-        $_REQUEST['query'] = 'query';
+        $_POST['database'] = "database";
+        $_POST['query'] = 'query';
         $GLOBALS['server'] = 'server';
         $GLOBALS['cached_affected_rows'] = 'cached_affected_rows';
         $_SESSION['cache']['server_server']['profiling_supported'] = true;
diff --git a/test/classes/Server/Status/ProcessesTest.php b/test/classes/Server/Status/ProcessesTest.php
index 7fc981da06..767bb5c887 100644
--- a/test/classes/Server/Status/ProcessesTest.php
+++ b/test/classes/Server/Status/ProcessesTest.php
@@ -135,10 +135,10 @@ class ProcessesTest extends TestCase
             $html
         );
 
-        $_REQUEST['full'] = true;
-        $_REQUEST['sort_order'] = 'ASC';
-        $_REQUEST['order_by_field'] = 'db';
-        $_REQUEST['column_name'] = 'Database';
+        $_POST['full'] = true;
+        $_POST['sort_order'] = 'ASC';
+        $_POST['order_by_field'] = 'db';
+        $_POST['column_name'] = 'Database';
         $html = Processes::getHtmlForServerProcesslist();
 
         $this->assertContains(
@@ -154,9 +154,9 @@ class ProcessesTest extends TestCase
             $html
         );
 
-        $_REQUEST['sort_order'] = 'DESC';
-        $_REQUEST['order_by_field'] = 'Host';
-        $_REQUEST['column_name'] = 'Host';
+        $_POST['sort_order'] = 'DESC';
+        $_POST['order_by_field'] = 'Host';
+        $_POST['column_name'] = 'Host';
         $html = Processes::getHtmlForServerProcesslist();
 
         $this->assertContains(
@@ -189,20 +189,16 @@ class ProcessesTest extends TestCase
         ];
         $show_full_sql = true;
 
-        $_REQUEST['sort_order'] = "desc";
-        $_REQUEST['order_by_field'] = "process";
+        $_POST['sort_order'] = "desc";
+        $_POST['order_by_field'] = "process";
         $GLOBALS['cfg']['MaxCharactersInDisplayedSQL'] = 12;
 
         //Call the test function
         $html = Processes::getHtmlForServerProcessItem($process, $show_full_sql);
 
         //validate 1: $kill_process
-        $url_params = [
-            'kill' => $process['id'],
-            'ajax_request' => true
-        ];
-        $kill_process = 'server_status_processes.php'
-            . Url::getCommon($url_params);
+        $kill_process = 'href="server_status_processes.php" data-post="'
+            . Url::getCommon(['kill' => $process['id']], '') . '"';
         $this->assertContains(
             $kill_process,
             $html
diff --git a/test/classes/Server/Status/VariablesTest.php b/test/classes/Server/Status/VariablesTest.php
index b875256481..164061245d 100644
--- a/test/classes/Server/Status/VariablesTest.php
+++ b/test/classes/Server/Status/VariablesTest.php
@@ -37,10 +37,6 @@ class VariablesTest extends TestCase
      */
     protected function setUp()
     {
-        //$_REQUEST
-        $_REQUEST['log'] = "index1";
-        $_REQUEST['pos'] = 3;
-
         //$GLOBALS
         $GLOBALS['cfg']['MaxRows'] = 10;
         $GLOBALS['cfg']['ServerDefault'] = "server";
diff --git a/test/classes/Server/UserGroupsTest.php b/test/classes/Server/UserGroupsTest.php
index 8e98b53d6e..71b2dd2eb3 100644
--- a/test/classes/Server/UserGroupsTest.php
+++ b/test/classes/Server/UserGroupsTest.php
@@ -125,33 +125,36 @@ class UserGroupsTest extends TestCase
             '<td>usergroup</td>',
             $html
         );
-        $url_tag = '<a class="" href="server_user_groups.php'
+        $url_tag = '<a class="" href="server_user_groups.php" data-post="'
             . Url::getCommon(
                 [
                     'viewUsers' => 1, 'userGroup' => htmlspecialchars('usergroup')
-                ]
+                ],
+                ''
             );
         $this->assertContains(
             $url_tag,
             $html
         );
-        $url_tag = '<a class="" href="server_user_groups.php'
+        $url_tag = '<a class="" href="server_user_groups.php" data-post="'
             . Url::getCommon(
                 [
                     'editUserGroup' => 1,
                     'userGroup' => htmlspecialchars('usergroup')
-                ]
+                ],
+                ''
             );
         $this->assertContains(
             $url_tag,
             $html
         );
-        $url_tag = '<a class="deleteUserGroup ajax" href="server_user_groups.php'
+        $url_tag = '<a class="deleteUserGroup ajax" href="server_user_groups.php" data-post="'
             . Url::getCommon(
                 [
                     'deleteUserGroup' => 1,
                     'userGroup' => htmlspecialchars('usergroup')
-                ]
+                ],
+                ''
             );
         $this->assertContains(
             $url_tag,
diff --git a/test/classes/TableTest.php b/test/classes/TableTest.php
index 4a5b09490d..e18cf69c43 100644
--- a/test/classes/TableTest.php
+++ b/test/classes/TableTest.php
@@ -1071,7 +1071,7 @@ class TableTest extends PmaTestCase
         $index = new Index();
         $error = false;
 
-        $_REQUEST['old_index'] = "PRIMARY";
+        $_POST['old_index'] = "PRIMARY";
 
         $table = new Table($table, $db);
         $sql = $table->getSqlQueryForIndexCreateOrEdit($index, $error);
@@ -1271,7 +1271,7 @@ class TableTest extends PmaTestCase
         $GLOBALS['dbi']->expects($this->any())->method('getTable')
             ->will($this->returnValue(new Table($target_table, $target_db)));
 
-        $_REQUEST['drop_if_exists'] = true;
+        $_POST['drop_if_exists'] = true;
 
         $return = Table::moveCopy(
             $source_db,
diff --git a/test/classes/TrackingTest.php b/test/classes/TrackingTest.php
index f8938fa8d7..d0db9b6db3 100644
--- a/test/classes/TrackingTest.php
+++ b/test/classes/TrackingTest.php
@@ -36,9 +36,6 @@ class TrackingTest extends TestCase
         /**
          * SET these to avoid undefined index error
          */
-        $_REQUEST['db'] = "db";
-        $_REQUEST['table'] = "table";
-
         $GLOBALS['server'] = 1;
         $GLOBALS['db'] = "PMA_db";
         $GLOBALS['table'] = "PMA_table";
@@ -461,11 +458,11 @@ class TrackingTest extends TestCase
      */
     public function testGetHtmlForTrackingReportr()
     {
-        $_REQUEST['version'] = 10;
-        $_REQUEST['date_from'] = "date_from";
-        $_REQUEST['date_to'] = "date_to";
-        $_REQUEST['users'] = "users";
-        $_REQUEST['logtype'] = 'logtype';
+        $_POST['version'] = 10;
+        $_POST['date_from'] = "date_from";
+        $_POST['date_to'] = "date_to";
+        $_POST['users'] = "users";
+        $_POST['logtype'] = 'logtype';
         $url_query = "select * from PMA";
         $data = [
             'tracking' => 'tracking',
@@ -512,12 +509,10 @@ class TrackingTest extends TestCase
             $html
         );
 
-        $version = '<form method="post" action="tbl_tracking.php'
-            . Url::getCommon(
-                $url_params + [
-                    'report' => 'true', 'version' => $_REQUEST['version']
-                ]
-            );
+        $version = Url::getHiddenInputs($url_params + [
+            'report' => 'true',
+            'version' => $_POST['version'],
+        ]);
 
         $this->assertContains(
             $version,
@@ -545,17 +540,17 @@ class TrackingTest extends TestCase
         );
 
         $this->assertContains(
-            htmlspecialchars($_REQUEST['date_from']),
+            htmlspecialchars($_POST['date_from']),
             $html
         );
 
         $this->assertContains(
-            htmlspecialchars($_REQUEST['date_to']),
+            htmlspecialchars($_POST['date_to']),
             $html
         );
 
         $this->assertContains(
-            htmlspecialchars($_REQUEST['users']),
+            htmlspecialchars($_POST['users']),
             $html
         );
     }
@@ -568,7 +563,7 @@ class TrackingTest extends TestCase
      */
     public function testGetHtmlForDataManipulationStatements()
     {
-        $_REQUEST['version'] = "10";
+        $_POST['version'] = "10";
         $data = [
             'tracking' => 'tracking',
             'dmlog' => [
@@ -631,7 +626,7 @@ class TrackingTest extends TestCase
      */
     public function testGetHtmlForDataDefinitionStatements()
     {
-        $_REQUEST['version'] = "10";
+        $_POST['version'] = "10";
 
         $data = [
             'tracking' => 'tracking',
@@ -774,16 +769,16 @@ class TrackingTest extends TestCase
      */
     public function testGetTrackingSet()
     {
-        $_REQUEST['alter_table'] = false;
-        $_REQUEST['rename_table'] = true;
-        $_REQUEST['create_table'] = true;
-        $_REQUEST['drop_table'] = true;
-        $_REQUEST['create_index'] = false;
-        $_REQUEST['drop_index'] = true;
-        $_REQUEST['insert'] = true;
-        $_REQUEST['update'] = false;
-        $_REQUEST['delete'] = true;
-        $_REQUEST['truncate'] = true;
+        $_POST['alter_table'] = false;
+        $_POST['rename_table'] = true;
+        $_POST['create_table'] = true;
+        $_POST['drop_table'] = true;
+        $_POST['create_index'] = false;
+        $_POST['drop_index'] = true;
+        $_POST['insert'] = true;
+        $_POST['update'] = false;
+        $_POST['delete'] = true;
+        $_POST['truncate'] = true;
 
         $tracking_set = $this->tracking->getTrackingSet();
         $this->assertEquals(
@@ -792,16 +787,16 @@ class TrackingTest extends TestCase
         );
 
         //other set to true
-        $_REQUEST['alter_table'] = true;
-        $_REQUEST['rename_table'] = false;
-        $_REQUEST['create_table'] = false;
-        $_REQUEST['drop_table'] = false;
-        $_REQUEST['create_index'] = true;
-        $_REQUEST['drop_index'] = false;
-        $_REQUEST['insert'] = false;
-        $_REQUEST['update'] = true;
-        $_REQUEST['delete'] = false;
-        $_REQUEST['truncate'] = false;
+        $_POST['alter_table'] = true;
+        $_POST['rename_table'] = false;
+        $_POST['create_table'] = false;
+        $_POST['drop_table'] = false;
+        $_POST['create_index'] = true;
+        $_POST['drop_index'] = false;
+        $_POST['insert'] = false;
+        $_POST['update'] = true;
+        $_POST['delete'] = false;
+        $_POST['truncate'] = false;
 
         $tracking_set = $this->tracking->getTrackingSet();
         $this->assertEquals(
@@ -819,7 +814,7 @@ class TrackingTest extends TestCase
      */
     public function testGetEntries()
     {
-        $_REQUEST['logtype'] = 'schema';
+        $_POST['logtype'] = 'schema';
         $data = [
             'tracking' => 'tracking',
             'ddlog' => [
diff --git a/test/classes/TransformationsTest.php b/test/classes/TransformationsTest.php
index 5a5b8faaf0..438a533e44 100644
--- a/test/classes/TransformationsTest.php
+++ b/test/classes/TransformationsTest.php
@@ -304,4 +304,64 @@ class TransformationsTest extends TestCase
             ],
         ];
     }
+
+    /**
+     * Test for getDescription
+     *
+     * @param string $file                transformation file
+     * @param string $expectedDescription expected description
+     *
+     * @return void
+     *
+     * @dataProvider providerGetDescription
+     */
+    public function testGetDescription($file, $expectedDescription)
+    {
+        $this->assertEquals(
+            $expectedDescription,
+            $this->transformations->getDescription($file)
+        );
+    }
+
+    /**
+     * @return array
+     */
+    public function providerGetDescription()
+    {
+        return [
+            ['../../../../test', ''],
+            ['Input/Text_Plain_SqlEditor', 'Syntax highlighted CodeMirror editor for SQL.'],
+            ['Output/Text_Plain_Sql', 'Formats text as SQL query with syntax highlighting.']
+        ];
+    }
+
+    /**
+     * Test for getName
+     *
+     * @param string $file         transformation file
+     * @param string $expectedName expected name
+     *
+     * @return void
+     *
+     * @dataProvider providerGetName
+     */
+    public function testGetName($file, $expectedName)
+    {
+        $this->assertEquals(
+            $expectedName,
+            $this->transformations->getName($file)
+        );
+    }
+
+    /**
+     * @return array
+     */
+    public function providerGetName()
+    {
+        return [
+            ['../../../../test', ''],
+            ['Input/Text_Plain_SqlEditor', 'SQL'],
+            ['Output/Text_Plain_Sql', 'SQL']
+        ];
+    }
 }
diff --git a/url.php b/url.php
index 77056f83eb..4f84e0e5ec 100644
--- a/url.php
+++ b/url.php
@@ -22,9 +22,9 @@ $response = Response::getInstance();
 $response->getHeader()->sendHttpHeaders();
 $response->disable();
 
-if (! Core::isValid($_REQUEST['url'])
-    || ! preg_match('/^https:\/\/[^\n\r]*$/', $_REQUEST['url'])
-    || ! Core::isAllowedDomain($_REQUEST['url'])
+if (! Core::isValid($_GET['url'])
+    || ! preg_match('/^https:\/\/[^\n\r]*$/', $_GET['url'])
+    || ! Core::isAllowedDomain($_GET['url'])
 ) {
     Core::sendHeaderLocation('./');
 } else {
@@ -34,11 +34,11 @@ if (! Core::isValid($_REQUEST['url'])
     //  external site.
     echo "<script type='text/javascript'>
             window.onload=function(){
-                window.location='" , Sanitize::escapeJsString($_REQUEST['url']) , "';
+                window.location='" , Sanitize::escapeJsString($_GET['url']) , "';
             }
         </script>";
     // Display redirecting msg on screen.
-    // Do not display the value of $_REQUEST['url'] to avoid showing injected content
+    // Do not display the value of $_GET['url'] to avoid showing injected content
     echo __('Taking you to the target site.');
 }
 die();
diff --git a/user_password.php b/user_password.php
index b4b30c4c4e..ac402288bc 100644
--- a/user_password.php
+++ b/user_password.php
@@ -52,11 +52,11 @@ if ($cfg['Server']['auth_type'] == 'config' || ! $cfg['ShowChgPassword']) {
  * If the "change password" form has been submitted, checks for valid values
  * and submit the query or logout
  */
-if (isset($_REQUEST['nopass'])) {
-    if ($_REQUEST['nopass'] == '1') {
+if (isset($_POST['nopass'])) {
+    if ($_POST['nopass'] == '1') {
         $password = '';
     } else {
-        $password = $_REQUEST['pma_pw'];
+        $password = $_POST['pma_pw'];
     }
     $change_password_message = $userPassword->setChangePasswordMsg();
     $msg = $change_password_message['msg'];
diff --git a/view_create.php b/view_create.php
index 9c34b6ed58..9a45eaaa76 100644
--- a/view_create.php
+++ b/view_create.php
@@ -45,8 +45,8 @@ $view_security_options = [
 ];
 
 // View name is a compulsory field
-if (isset($_REQUEST['view']['name'])
-    && empty($_REQUEST['view']['name'])
+if (isset($_POST['view']['name'])
+    && empty($_POST['view']['name'])
 ) {
     $message = Message::error(__('View name can not be empty!'));
     $response->addJSON(
@@ -57,61 +57,61 @@ if (isset($_REQUEST['view']['name'])
     exit;
 }
 
-if (isset($_REQUEST['createview']) || isset($_REQUEST['alterview'])) {
+if (isset($_POST['createview']) || isset($_POST['alterview'])) {
     /**
      * Creates the view
      */
     $sep = "\r\n";
 
-    if (isset($_REQUEST['createview'])) {
+    if (isset($_POST['createview'])) {
         $sql_query = 'CREATE';
-        if (isset($_REQUEST['view']['or_replace'])) {
+        if (isset($_POST['view']['or_replace'])) {
             $sql_query .= ' OR REPLACE';
         }
     } else {
         $sql_query = 'ALTER';
     }
 
-    if (Core::isValid($_REQUEST['view']['algorithm'], $view_algorithm_options)) {
-        $sql_query .= $sep . ' ALGORITHM = ' . $_REQUEST['view']['algorithm'];
+    if (Core::isValid($_POST['view']['algorithm'], $view_algorithm_options)) {
+        $sql_query .= $sep . ' ALGORITHM = ' . $_POST['view']['algorithm'];
     }
 
-    if (! empty($_REQUEST['view']['definer'])) {
-        if (strpos($_REQUEST['view']['definer'], '@') === false) {
+    if (! empty($_POST['view']['definer'])) {
+        if (strpos($_POST['view']['definer'], '@') === false) {
             $sql_query .= $sep . 'DEFINER='
-                . Util::backquote($_REQUEST['view']['definer']);
+                . Util::backquote($_POST['view']['definer']);
         } else {
-            $arr = explode('@', $_REQUEST['view']['definer']);
+            $arr = explode('@', $_POST['view']['definer']);
             $sql_query .= $sep . 'DEFINER=' . Util::backquote($arr[0]);
             $sql_query .= '@' . Util::backquote($arr[1]) . ' ';
         }
     }
 
-    if (isset($_REQUEST['view']['sql_security'])) {
-        if (in_array($_REQUEST['view']['sql_security'], $view_security_options)) {
+    if (isset($_POST['view']['sql_security'])) {
+        if (in_array($_POST['view']['sql_security'], $view_security_options)) {
             $sql_query .= $sep . ' SQL SECURITY '
-                . $_REQUEST['view']['sql_security'];
+                . $_POST['view']['sql_security'];
         }
     }
 
     $sql_query .= $sep . ' VIEW '
-        . Util::backquote($_REQUEST['view']['name']);
+        . Util::backquote($_POST['view']['name']);
 
-    if (! empty($_REQUEST['view']['column_names'])) {
-        $sql_query .= $sep . ' (' . $_REQUEST['view']['column_names'] . ')';
+    if (! empty($_POST['view']['column_names'])) {
+        $sql_query .= $sep . ' (' . $_POST['view']['column_names'] . ')';
     }
 
-    $sql_query .= $sep . ' AS ' . $_REQUEST['view']['as'];
+    $sql_query .= $sep . ' AS ' . $_POST['view']['as'];
 
-    if (isset($_REQUEST['view']['with'])) {
-        if (in_array($_REQUEST['view']['with'], $view_with_options)) {
-            $sql_query .= $sep . ' WITH ' . $_REQUEST['view']['with']
+    if (isset($_POST['view']['with'])) {
+        if (in_array($_POST['view']['with'], $view_with_options)) {
+            $sql_query .= $sep . ' WITH ' . $_POST['view']['with']
                 . '  CHECK OPTION';
         }
     }
 
     if (!$GLOBALS['dbi']->tryQuery($sql_query)) {
-        if (! isset($_REQUEST['ajax_dialog'])) {
+        if (! isset($_POST['ajax_dialog'])) {
             $message = Message::rawError($GLOBALS['dbi']->getError());
             return;
         }
@@ -129,12 +129,12 @@ if (isset($_REQUEST['createview']) || isset($_REQUEST['alterview'])) {
 
     // If different column names defined for VIEW
     $view_columns = [];
-    if (isset($_REQUEST['view']['column_names'])) {
-        $view_columns = explode(',', $_REQUEST['view']['column_names']);
+    if (isset($_POST['view']['column_names'])) {
+        $view_columns = explode(',', $_POST['view']['column_names']);
     }
 
     $column_map = $GLOBALS['dbi']->getColumnMapFromSql(
-        $_REQUEST['view']['as'],
+        $_POST['view']['as'],
         $view_columns
     );
 
@@ -148,7 +148,7 @@ if (isset($_REQUEST['createview']) || isset($_REQUEST['alterview'])) {
         $new_transformations_sql = $systemDb->getNewTransformationDataSql(
             $pma_transformation_data,
             $column_map,
-            $_REQUEST['view']['name'],
+            $_POST['view']['name'],
             $GLOBALS['db']
         );
 
@@ -159,7 +159,7 @@ if (isset($_REQUEST['createview']) || isset($_REQUEST['alterview'])) {
     }
     unset($pma_transformation_data);
 
-    if (! isset($_REQUEST['ajax_dialog'])) {
+    if (! isset($_POST['ajax_dialog'])) {
         $message = Message::success();
         include 'tbl_structure.php';
     } else {
@@ -191,15 +191,15 @@ $view = [
     'with' => '',
 ];
 
-if (Core::isValid($_REQUEST['view'], 'array')) {
-    $view = array_merge($view, $_REQUEST['view']);
+if (Core::isValid($_POST['view'], 'array')) {
+    $view = array_merge($view, $_POST['view']);
 }
 
 $url_params['db'] = $GLOBALS['db'];
 $url_params['reload'] = 1;
 
 echo $template->render('view_create', [
-    'ajax_dialog' => isset($_REQUEST['ajax_dialog']),
+    'ajax_dialog' => isset($_POST['ajax_dialog']),
     'text_dir' => $text_dir,
     'url_params' => $url_params,
     'view' => $view,
diff --git a/view_operations.php b/view_operations.php
index a778490a40..d268bec74a 100644
--- a/view_operations.php
+++ b/view_operations.php
@@ -45,9 +45,9 @@ $operations = new Operations($GLOBALS['dbi'], $relation);
  */
 $_message = new Message();
 $_type = 'success';
-if (isset($_REQUEST['submitoptions'])) {
-    if (isset($_REQUEST['new_name'])) {
-        if ($pma_table->rename($_REQUEST['new_name'])) {
+if (isset($_POST['submitoptions'])) {
+    if (isset($_POST['new_name'])) {
+        if ($pma_table->rename($_POST['new_name'])) {
             $_message->addText($pma_table->getLastMessage());
             $result = true;
             $GLOBALS['table'] = $pma_table->getName();