diff --git a/libraries/classes/Config.php b/libraries/classes/Config.php
index c311c30f7e..c775cb9af6 100644
--- a/libraries/classes/Config.php
+++ b/libraries/classes/Config.php
@@ -18,6 +18,7 @@ use PhpMyAdmin\Url;
 use PhpMyAdmin\UserPreferences;
 use PhpMyAdmin\Util;
 use PhpMyAdmin\Utils\HttpRequest;
+use PhpMyAdmin\Config;
 
 /**
  * Indication for error handler (see end of this file).
@@ -1750,5 +1751,5 @@ class Config
 }
 
 if (! defined('TESTSUITE')) {
-    register_shutdown_function(['PhpMyAdmin\Config', 'fatalErrorHandler']);
+    register_shutdown_function([Config::class, 'fatalErrorHandler']);
 }
diff --git a/libraries/classes/Database/Qbe.php b/libraries/classes/Database/Qbe.php
index db745fa0cf..5c8c698290 100644
--- a/libraries/classes/Database/Qbe.php
+++ b/libraries/classes/Database/Qbe.php
@@ -1512,8 +1512,8 @@ class Qbe
         if (empty($from_clause)) {
             // Create cartesian product
             $from_clause = implode(
-                ", ",
-                array_map(['PhpMyAdmin\Util', 'backquote'], $search_tables)
+                ', ',
+                array_map([Util::class, 'backquote'], $search_tables)
             );
         }
 
@@ -1622,7 +1622,7 @@ class Qbe
                 // Add these tables as cartesian product before joined tables
                 $join .= implode(
                     ', ',
-                    array_map(['PhpMyAdmin\Util', 'backquote'], $unfinalized)
+                    array_map([Util::class, 'backquote'], $unfinalized)
                 );
             }
         }
diff --git a/libraries/classes/Display/Results.php b/libraries/classes/Display/Results.php
index d3b3c3f5ad..821e543d25 100644
--- a/libraries/classes/Display/Results.php
+++ b/libraries/classes/Display/Results.php
@@ -27,6 +27,9 @@ use PhpMyAdmin\Url;
 use PhpMyAdmin\Util;
 use \stdClass;
 use PhpMyAdmin\Plugins\TransformationsPlugin;
+use PhpMyAdmin\Plugins\Transformations\Output\Text_Plain_Json;
+use PhpMyAdmin\Plugins\Transformations\Output\Text_Octetstream_Sql;
+use PhpMyAdmin\Plugins\Transformations\Output\Text_Plain_Sql;
 
 /**
  * Handle all the functionalities related to displaying results
@@ -262,22 +265,22 @@ class Results
     {
         $json_highlighting_data = [
             'libraries/classes/Plugins/Transformations/Output/Text_Plain_Json.php',
-            'PhpMyAdmin\Plugins\Transformations\Output\Text_Plain_Json',
+            Text_Plain_Json::class,
             'Text_Plain',
         ];
         $sql_highlighting_data = [
             'libraries/classes/Plugins/Transformations/Output/Text_Plain_Sql.php',
-            'PhpMyAdmin\Plugins\Transformations\Output\Text_Plain_Sql',
+            Text_Plain_Sql::class,
             'Text_Plain',
         ];
         $blob_sql_highlighting_data = [
             'libraries/classes/Plugins/Transformations/Output/Text_Octetstream_Sql.php',
-            'PhpMyAdmin\Plugins\Transformations\Output\Text_Octetstream_Sql',
+            Text_Octetstream_Sql::class,
             'Text_Octetstream',
         ];
         $link_data = [
             'libraries/classes/Plugins/Transformations/Text_Plain_Link.php',
-            'PhpMyAdmin\Plugins\Transformations\Text_Plain_Link',
+            Text_Plain_Link::class,
             'Text_Plain',
         ];
         $this->transformation_info = [
diff --git a/libraries/classes/Navigation/NavigationTree.php b/libraries/classes/Navigation/NavigationTree.php
index 4288359112..6a227abf21 100644
--- a/libraries/classes/Navigation/NavigationTree.php
+++ b/libraries/classes/Navigation/NavigationTree.php
@@ -21,6 +21,7 @@ use PhpMyAdmin\Response;
 use PhpMyAdmin\Template;
 use PhpMyAdmin\Util;
 use PhpMyAdmin\Url;
+use PhpMyAdmin\Navigation\NavigationTree;
 
 /**
  * Displays a collapsible of database objects in the navigation frame
@@ -880,7 +881,7 @@ class NavigationTree
         $this->groupTree();
         $children = $this->_tree->children;
         usort($children, [
-            'PhpMyAdmin\\Navigation\\NavigationTree',
+            NavigationTree::class,
             'sortNode',
         ]);
         $this->_setVisibility();
@@ -922,7 +923,7 @@ class NavigationTree
             $listContent .= $this->_getPageSelector($node);
             $children = $node->children;
             usort($children, [
-                'PhpMyAdmin\\Navigation\\NavigationTree',
+                NavigationTree::class,
                 'sortNode',
             ]);
 
@@ -1228,7 +1229,7 @@ class NavigationTree
             usort(
                 $children,
                 [
-                    'PhpMyAdmin\\Navigation\\NavigationTree',
+                    NavigationTree::class,
                     'sortNode',
                 ]
             );
@@ -1314,7 +1315,7 @@ class NavigationTree
 
         $children = $this->_tree->children;
         usort($children, [
-            'PhpMyAdmin\\Navigation\\NavigationTree',
+            NavigationTree::class,
             'sortNode',
         ]);
         $this->_setVisibility();
diff --git a/libraries/classes/Plugins.php b/libraries/classes/Plugins.php
index 6aad9bfe19..b43f679dec 100644
--- a/libraries/classes/Plugins.php
+++ b/libraries/classes/Plugins.php
@@ -14,6 +14,14 @@ use PhpMyAdmin\Properties\Options\OptionsPropertyItem;
 use PhpMyAdmin\Properties\Plugins\ExportPluginProperties;
 use PhpMyAdmin\Properties\Plugins\PluginPropertyItem;
 use PhpMyAdmin\Properties\Plugins\SchemaPluginProperties;
+use PhpMyAdmin\Properties\Options\Items\HiddenPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\NumberPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\TextPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\SelectPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\RadioPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\MessageOnlyPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\DocPropertyItem;
+use PhpMyAdmin\Properties\Options\Items\BoolPropertyItem;
 
 /**
  * PhpMyAdmin\Plugins class
@@ -418,7 +426,7 @@ class Plugins
         $ret = null;
         $property_class = get_class($propertyItem);
         switch ($property_class) {
-            case 'PhpMyAdmin\Properties\Options\Items\BoolPropertyItem':
+            case BoolPropertyItem::class:
                 $ret .= '<li>' . "\n";
                 $ret .= '<input type="checkbox" name="' . $plugin_name . '_'
                 . $propertyItem->getName() . '"'
@@ -445,10 +453,10 @@ class Plugins
                 . $propertyItem->getName() . '">'
                 . self::getString($propertyItem->getText()) . '</label>';
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\DocPropertyItem':
-                echo 'PhpMyAdmin\Properties\Options\Items\DocPropertyItem';
+            case DocPropertyItem::class:
+                echo DocPropertyItem::class;
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\HiddenPropertyItem':
+            case HiddenPropertyItem::class:
                 $ret .= '<li><input type="hidden" name="' . $plugin_name . '_'
                 . $propertyItem->getName() . '"'
                 . ' value="' . self::getDefault(
@@ -457,11 +465,11 @@ class Plugins
                 )
                     . '"' . '></li>';
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\MessageOnlyPropertyItem':
+            case MessageOnlyPropertyItem::class:
                 $ret .= '<li>' . "\n";
                 $ret .= '<p>' . self::getString($propertyItem->getText()) . '</p>';
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\RadioPropertyItem':
+            case RadioPropertyItem::class:
                 /**
                  * @var \PhpMyAdmin\Properties\Options\Items\RadioPropertyItem $pitem
                  */
@@ -485,7 +493,7 @@ class Plugins
                     . self::getString($val) . '</label></li>';
                 }
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\SelectPropertyItem':
+            case SelectPropertyItem::class:
                 /**
                  * @var \PhpMyAdmin\Properties\Options\Items\SelectPropertyItem $pitem
                  */
@@ -512,7 +520,7 @@ class Plugins
 
                 $ret .= '</select>';
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\TextPropertyItem':
+            case TextPropertyItem::class:
                 /**
                  * @var \PhpMyAdmin\Properties\Options\Items\TextPropertyItem $pitem
                  */
@@ -537,7 +545,7 @@ class Plugins
                     : '')
                     . '>';
                 break;
-            case 'PhpMyAdmin\Properties\Options\Items\NumberPropertyItem':
+            case NumberPropertyItem::class:
                 $ret .= '<li>' . "\n";
                 $ret .= '<label for="number_' . $plugin_name . '_'
                     . $propertyItem->getName() . '" class="desc">'
@@ -600,7 +608,7 @@ class Plugins
                     // check for hidden properties
                     $no_options = true;
                     foreach ($propertyMainGroup->getProperties() as $propertyItem) {
-                        if (strcmp('PhpMyAdmin\Properties\Options\Items\HiddenPropertyItem', get_class($propertyItem))) {
+                        if (strcmp(HiddenPropertyItem::class, get_class($propertyItem))) {
                             $no_options = false;
                             break;
                         }
diff --git a/libraries/classes/Plugins/Auth/AuthenticationCookie.php b/libraries/classes/Plugins/Auth/AuthenticationCookie.php
index 63a2fabdda..92d0d33af0 100644
--- a/libraries/classes/Plugins/Auth/AuthenticationCookie.php
+++ b/libraries/classes/Plugins/Auth/AuthenticationCookie.php
@@ -23,6 +23,7 @@ use PhpMyAdmin\Util;
 use PhpMyAdmin\Url;
 use phpseclib\Crypt;
 use ReCaptcha;
+use phpseclib\Crypt\Random;
 
 /**
  * Remember where to redirect the user
@@ -57,7 +58,7 @@ class AuthenticationCookie extends AuthenticationPlugin
     public function __construct()
     {
         parent::__construct();
-        $this->_use_openssl = ! class_exists('phpseclib\Crypt\Random');
+        $this->_use_openssl = ! class_exists(Random::class);
     }
 
     /**
diff --git a/libraries/classes/TwoFactor.php b/libraries/classes/TwoFactor.php
index a5f84dcb4f..88f0d17c00 100644
--- a/libraries/classes/TwoFactor.php
+++ b/libraries/classes/TwoFactor.php
@@ -10,6 +10,10 @@ declare(strict_types=1);
 namespace PhpMyAdmin;
 
 use PhpMyAdmin\UserPreferences;
+use PhpMyAdmin\Plugins\TwoFactor\Invalid;
+use PhpMyAdmin\Plugins\TwoFactorPlugin;
+use Samyoul\U2F\U2FServer\U2FServer;
+use PragmaRX\Google2FAQRCode\Google2FA;
 
 /**
  * Two factor authentication wrapper class
@@ -118,10 +122,10 @@ class TwoFactor
         if ($GLOBALS['cfg']['DBG']['simple2fa']) {
             $result[] = 'simple';
         }
-        if (class_exists('PragmaRX\Google2FAQRCode\Google2FA')) {
+        if (class_exists(Google2FA::class)) {
             $result[] = 'application';
         }
-        if (class_exists('Samyoul\U2F\U2FServer\U2FServer')) {
+        if (class_exists(U2FServer::class)) {
             $result[] = 'key';
         }
         return $result;
@@ -135,7 +139,7 @@ class TwoFactor
     public function getMissingDeps()
     {
         $result = [];
-        if (! class_exists('PragmaRX\Google2FAQRCode\Google2FA')) {
+        if (! class_exists(Google2FA::class)) {
             $result[] = [
                 'class' => \PhpMyAdmin\Plugins\TwoFactor\Application::getName(),
                 'dep' => 'pragmarx/google2fa-qrcode',
@@ -147,7 +151,7 @@ class TwoFactor
                 'dep' => 'bacon/bacon-qr-code',
             ];
         }
-        if (! class_exists('Samyoul\U2F\U2FServer\U2FServer')) {
+        if (! class_exists(U2FServer::class)) {
             $result[] = [
                 'class' => \PhpMyAdmin\Plugins\TwoFactor\Key::getName(),
                 'dep' => 'samyoul/u2f-php-server',
@@ -165,11 +169,11 @@ class TwoFactor
      */
     public function getBackendClass($name)
     {
-        $result = 'PhpMyAdmin\\Plugins\\TwoFactorPlugin';
+        $result = TwoFactorPlugin::class;
         if (in_array($name, $this->_available)) {
             $result = 'PhpMyAdmin\\Plugins\\TwoFactor\\' . ucfirst($name);
         } elseif (! empty($name)) {
-            $result = 'PhpMyAdmin\\Plugins\\TwoFactor\\Invalid';
+            $result = Invalid::class;
         }
         return $result;
     }
diff --git a/libraries/classes/Util.php b/libraries/classes/Util.php
index 7decbd211d..fc866982fd 100644
--- a/libraries/classes/Util.php
+++ b/libraries/classes/Util.php
@@ -25,6 +25,7 @@ use PhpMyAdmin\Template;
 use PhpMyAdmin\Url;
 use Williamdes\MariaDBMySQLKBS\Search as KBSearch;
 use Williamdes\MariaDBMySQLKBS\KBException;
+use phpseclib\Crypt\Random;
 
 /**
  * Misc functions used all over the scripts.
@@ -4797,9 +4798,9 @@ class Util
     public static function generateRandom($length)
     {
         $result = '';
-        if (class_exists('phpseclib\\Crypt\\Random')) {
+        if (class_exists(Random::class)) {
             $random_func = [
-                'phpseclib\\Crypt\\Random',
+                Random::class,
                 'string',
             ];
         } else {