4. [PHP-PDO](http://php.net/manual/en/book.pdo.php) with appropriate <del>[driver for your database](http://www.php.net/manual/en/pdo.drivers.php)</del> (only MySQL is supported at the moment)
4. [PHP-PDO](http://php.net/manual/en/book.pdo.php) with appropriate <del>[driver for your database](http://www.php.net/manual/en/pdo.drivers.php)</del> (only MySQL is supported at the moment)