Description:
------------
---
From manual page: http://www.php.net/filter.examples.validation
---

<?php
$ip_a = '127.0.0.1';
$ip_b = '42.42';

if (filter_var($ip_a, FILTER_VALIDATE_IP)) {
    echo "This (ip_a) IP address is considered valid.";
}
if (filter_var($ip_b, FILTER_VALIDATE_IP)) {
    echo "This (ip_b) IP address is considered valid.";
}
?>

This (ip_a) should be: This ($ip_a)
This (ip_b) should be: This ($ip_b)