حذف کردن منو و زیر منو ها

function menu_del($id)
{
global $db;
$user_id = filter_var($_SESSION['user_id'], FILTER_SANITIZE_NUMBER_INT,FILTER_FLAG_STRIP_LOW);
$q1= $db -> fetch("select * from `menu_product` where parent_id='$id' && id_admin='{$user_id}'");
$id_del = $q1['id'];
$db -> query("DELETE FROM `menu_product` WHERE id='{$id_del}' && id_admin='{$user_id}'");
$q2= $db -> rowcount("select * from `menu_product` where parent_id='$id_del' ");
if($q2>=0)
{
menu_del($id_del);
}
}