// Let us unset all global variables set by register globals
if(ini_get('register_globals') == true)
{
        if(isset($_REQUEST['GLOBALS']))
                exit('GLOBALS overwrite attempt detected! Exiting...');
       
        // Variables that shouldn't be unset
        $noUnset = array('GLOBALS', '_GET', '_POST', '_COOKIE', '_REQUEST', '_SERVER', '_ENV', '_FILES');
       
        $input = array_merge($_GET, $_POST, $_COOKIE, $_SERVER, $_ENV, $_FILES, isset($_SESSION) && is_array($_SESSION) ? $_SESSION : array());
        foreach($input as $k => $v)
                if(!in_array($k, $noUnset) && isset($GLOBALS[$k]))
                        unset($GLOBALS[$k]);
}