<?php $maxwidth = isset($_GET['maxwidth']) ? intval($_GET['maxwidth']) : null; if(null === $maxwidth || $maxwidth === "unknown") { $maxwidth = 3000; } // we need a number, so give it something unfeasable setcookie('resolution',$maxwidth,time()+604800,'/'); // set the cookie // respond with an empty content header('HTTP/1.1 204 No Content'); exit();