<html><body>$ip = "127.0.0.1";if (!filter_var($ip, FILTER_VALIDATE_IP) === false) { echo("$ip is a valid IP address");} else { echo("$ip is not a valid IP address");}</body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_filter5 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:29:33 GMT --></html>