SeatGeek\Sixpack\Session\Base::getIpAddress PHP Метод

    protected function getIpAddress()
    {
        $ordered_choices = array('HTTP_X_FORWARDED_FOR', 'HTTP_X_REAL_IP', 'HTTP_CLIENT_IP', 'REMOTE_ADDR');
        $invalid_ips = array('127.0.0.1', '::1');
        // check each server var in order
        // accepted ip must be non null and not in the invalid_ips list
        foreach ($ordered_choices as $var) {
            if (isset($_SERVER[$var])) {
                $ip = $_SERVER[$var];
                if ($ip && !in_array($ip, $invalid_ips)) {
                    $ips = explode(',', $ip);
                    return reset($ips);
                }
            }
        }
        return null;
    }