public function limit() 
    {
        $url = self::HOST . self::LIMIT;

        $params = $this->get_default_params();
        $result = $this->request($url, $params);
        $result = explode("\n", $result);

        return array(
            'code' => $result[0],
            'total' => $result[1],
            'current' => $result[2]
        );
    }