Phpmyadmin et joomla

<?php
define('DB_HOST','localhost');
define('DB_USER','root');
define('DB_PASS','');
define('DB_NAME', 'nom_de_la_base');

$fichier = 'requetes.sql';
$source = file_get_contents($fichier);
$requetes = explode(';', $source);

$pdo = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME, DB_USER, DB_PASS);

foreach($requetes as $sql) {
    $sql = trim($sql);
    $pdo->exec($sql);
}
?>