Merge remote-tracking branch 'origin/QA_4_6' into QA_4_6

ChangeLog

@@ -88,6 +88,7 @@ phpMyAdmin - ChangeLog
 - issue #12453 Fixed escaping of SQL parts in some corner cases
 - issue #12542 Missing table name in account privileges editor
 - issue #12691 Remove ksort call on empty array in PMA_getPlugins function
+- issue #12443 Check parameter type before processing
 
 4.6.4 (2016-08-16)
 - issue        [security] Weaknesses with cookie encryption, see PMASA-2016-29

db_export.php

@@ -109,7 +109,7 @@ foreach ($tables as $each_table) {
     } else {
         $structure_checked = $is_checked;
     }
-    if (isset($_GET['table_data'])) {
+    if (isset($_GET['table_data']) && is_array($_GET['table_data'])) {
         $data_checked = PMA_getCheckedClause(
             $each_table['Name'], $_GET['table_data']
         );