- var_dump: documentation ( source)
- filter_var: documentation ( source)
<?php
var_dump(filter_var('::ffff:192.168.1.1', FILTER_VALIDATE_IP, FILTER_FLAG_IPV4));
var_dump(filter_var('::ffff:192.168.1.1', FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE));
var_dump(filter_var('0:0:0:0:0:0:0:1', FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE));