protected function reset()
    {
        $this->_agent = '';
        $this->_browserName = self::BROWSER_UNKNOWN;
        $this->_compatibilityViewName = '';
        $this->_compatibilityViewVer = '';
        $this->_is64bit = false;
        $this->_isMobile = false;
        $this->_isRobot = false;
        $this->_platform = self::PLATFORM_UNKNOWN;
        $this->_platformVersion = self::PLATFORM_VERSION_UNKNOWN;
        $this->_version = self::VERSION_UNKNOWN;
    }