DLE Huge database deleting outdated post problem

[downfreak]

i tried to run

<?php
/**
* Developer: Soft2050
* IDE Used: JetBrains PhpStorm.
* Date: 10/9/11
* Time: 2:07 PM
*/

$dbhost = ''; // Enter your db host here
$dbuser = ''; // Enter db username here
$dbpass = ''; // Enter db password here'
$dbname = ''; // Enter your db name here

$connection = mysql_connect($dbhost, $dbuser, $dbpass) or die(mysqli_error());

mysql_select_db($dbname, $connection);

mysql_query("DELETE FROM `dle_post` LIMIT 1");

mysql_close($connection);

?>

but its not working...