protected function sendNewsItemToJsonString(WxSendNewsMsgItem $item)
    {
        $formatStr = '{
                         "title":"%s",
                         "description":"%s",
                         "url":"%s",
                         "picurl":"%s"
                     }';
        $result = sprintf($formatStr,   $item->getTitle(),
            $item->getDescription(),
            $item->getPicUrl(),
            $item->getUrl()
        );

        return $result;
    }