Somnathpawar

<?php $websiteUrl = $_REQUEST['url']; if (!preg_match("#^http(s)?://[a-z0-9-_.]+\.[a-z]{2,4}#i",$websiteUrl)) { echo "wrong url"; } else { echo "ok"; } ?> Check this one. This is perfect.

You can set directive in php.ini file to close the session when closed the browser session.cookie_lifetime = 0;