Online PHP editor | output for Fs7m8

<?php foreach(array( '', 'x', ' ', '0.0.0.0', '255.255.255.255', // Some bad IP '127.0.0.1', // localhost '10.0.0.0', '192.168.0.1', 'fe80::414a:a44e:53f2:e694%21',, 'fe80::414a:a44e:53f2:e694', // Private IP addresses '8.8.8.8', // Good ) as $ip) { echo "'$ip' => "; var_dump(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)); }