The usage of user-provided PDO instance is deprecated as of v2.10.0

UPGRADE.md

@@ -3,6 +3,7 @@
 ## `DBALException` factory method deprecations
 
 1. `DBALException::invalidPlatformType()` is deprecated as unused as of v2.7.0.
+2. `DBALException::invalidPdoInstance()` as passing a PDO instance via configuration is deprecated.
 
 ## `AbstractPlatform::fixSchemaElementName()` is deprecated.
 

lib/Doctrine/DBAL/DBALException.php

@@ -93,6 +93,8 @@ class DBALException extends Exception
     }
 
     /**
+     * @deprecated Passing a PDO instance in connection parameters is deprecated.
+     *
      * @return DBALException
      */
     public static function invalidPdoInstance()