php_PHP チュートリアルで実際のローカル IP を取得する

関数 real_ip()
{
    静的 $realip = NULL;

    if ($realip !== NULL)
    {
        $realip を返します;
    }

    if (isset($_SERVER))
    {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
        {
            $arr =explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

            foreach ($arr AS $ip)
            {
                $ip = トリム($ip);

                if ($ip != '不明')
                {
                    $realip = $ip;

                    休憩;
                }
            }
        }
        elseif (isset($_SERVER['HTTP_CLIENT_IP']))
        {
            $realip = $_SERVER['HTTP_CLIENT_IP'];
        }
        それ以外
        {
            if (isset($_SERVER['REMOTE_ADDR']))
            {
                $realip = $_SERVER['REMOTE_ADDR'];
            }
            それ以外
            {
                $realip = '0.0.0.0';
            }
        }
    }
    それ以外
    {
        if (getenv('HTTP_X_FORWARDED_FOR'))
        {
            $realip = getenv('HTTP_X_FORWARDED_FOR');
        }
        elseif (getenv('HTTP_CLIENT_IP'))
        {
            $realip = getenv('HTTP_CLIENT_IP');
        }
        それ以外
        {
            $realip = getenv('REMOTE_ADDR');
        }
    }

    preg_match("/[d.]{7,15}/", $realip, $onlineip);
    $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

    $realip を返します;
}

作者：荒村听雨31