function tisztogat($input){
$bkeys = array ("alert", "script", "applet", "iframe", "form", "input", "select", "drop", "delete", "update", "union", "benchmark", "object", "applet", "onmouseover", "onmouseout");
    if(is_array($input)){
        foreach($input as $k=>$i){
            $output[$k]=tisztogat($i);
        }
    }
    else{
	$tt .= $input .  ", ";
        foreach($bkeys as $bi){
            if(stristr($input, $bi) == TRUE) {
	    header('Location:index.php');
	    die();
            }
        }
    }   
}

tisztogat($_POST);
tisztogat($_GET);
tisztogat($_REQUEST);