if (isset($_COOKIE['id']) and isset($_COOKIE['hash']))
{
$userdata = mysql_fetch_assoc(mysql_query("SELECT * FROM users WHERE users_id = '".intval($_COOKIE['id'])."' LIMIT 1"));
if(($userdata['users_hash'] !== $_COOKIE['hash']) or ($userdata['users_id'] !== $_COOKIE['id']))
{
setcookie('id', '', time() - 60*24*30*12, '/');
setcookie('hash', '', time() - 60*24*30*12, '/');
header('Location: login.php'); exit();
if (isset($_COOKIE['id'], $_COOKIE['hash'])) {}