Don't set MYSQL_ATTR_MULTI_STATEMENTS by default

Fixes #18474

Author: brandonkelly

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Release Notes for Craft CMS 4
 
+## Unreleased
+
+- The `PDO::MYSQL_ATTR_MULTI_STATEMENTS` attribute is no longer set by default for database connections. ([#18474](https://github.com/craftcms/cms/issues/18474))
+
 ## 4.17.7 - 2026-02-24
 
 - The `PDO::MYSQL_ATTR_MULTI_STATEMENTS` attribute is now set to `false` by default for database connections.

src/helpers/App.php

@@ -34,7 +34,6 @@
 use craft\web\User as WebUser;
 use craft\web\View;
 use HTMLPurifier_Encoder;
-use PDO;
 use ReflectionClass;
 use ReflectionProperty;
 use Symfony\Component\Process\PhpExecutableFinder;
@@ -925,10 +924,7 @@ public static function dbConfig(?DbConfig $dbConfig = null): array
             'commandMap' => [
                 $driver => Command::class,
             ],
-            'attributes' => [
-                PDO::MYSQL_ATTR_MULTI_STATEMENTS => false,
-                ...$dbConfig->attributes,
-            ],
+            'attributes' => $dbConfig->attributes,
             'enableSchemaCache' => !static::devMode(),
         ];