SplType을 이용해 SplIp 타입을 만드는 예제

splip.php

<?php
class SplIp extends SplType
{
    const __default = 0;

    public function __construct($initial_value = '0.0.0.0', $strict = true)
    {
        if ($strict && ip2long($initial_value) === false) {
            throw new Exception('Invalid IP');
        }

        $this->ip = ip2long($initial_value);
    }
}

$ip = new SplIp();

echo $ip."\n";
?>