public function getUserAgent()
    {
        if (empty($this->userAgent)) {
            $this->userAgent = self::DEFAULT_USERAGENT;
        }
        return $this->userAgent;
    }
public function getUserAgent()
    {
        if (empty($this->userAgent)) {
            $this->userAgent = self::DEFAULT_USERAGENT;
        }
        return $this->userAgent;
    }
public function getUserAgent ( ) { if ( empty ( $ this -> userAgent ) ) { $ this -> userAgent = self :: DEFAULT_USERAGENT ; } return $ this -> userAgent ; }
Get user agent
@return string
Get user agent