protected function checkBrowserYandexWebmasterBot()
    {
        if (stripos($this->_agent, 'YandexWebmaster') !== false) {
            $aresult = explode('/', stristr($this->_agent, 'YandexWebmaster'));
            if (isset($aresult[1])) {
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion(str_replace(';', '', $aversion[0]));
                $this->_browser_name = self::BROWSER_YANDEXWEBMASTER_BOT;
                $this->setRobot(true);
                return true;
            }
        }
        return false;
    }