<code lang="PHP">
// 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]);
}
</code>