微信开发怎么被动发送图文消息用户输入信息之后回复

if( strtolower($postObj->MsgType) == 'text' && trim($postObj->Content)=='tuwen2' ){
            $toUser = $postObj->FromUserName;
            $fromUser = $postObj->ToUserName;
            $arr = array(
                array(
                    'title'=>'baidu',
                    'description'=>"baidu is very cool",
                    'picUrl'=>'http://pic.baidu.com/65464.png',
                    'url'=>'http://www.baidu.com',
                ),
                array(
                    'title'=>'hao123',
                    'description'=>"hao123 is very cool",
                    'picUrl'=>'https://www.baidu.com/img/bdlogo.png',
                    'url'=>'http://www.hao123.com',
                ),
                array(
                    'title'=>'廖圣平的博客',
                    'description'=>'廖圣平的博客22',
                    'picUrl'=>'http://img.mukewang.com/587c69610001b37b06000338-240-135.jpg',
        
                )
            );
            $template = "<xml>
            <ToUserName><![CDATA[%s]]></ToUserName>
            <FromUserName><![CDATA[%s]]></FromUserName>
            <CreateTime>%s</CreateTime>
            <MsgType><![CDATA[%s]]></MsgType>
            <ArticleCount>".count($arr)."</ArticleCount>
            <Articles>";
            foreach($arr as $k=>$v){
                $template .="<item>
              <Title><![CDATA[".$v['title']."]]></Title> 
              <Description><![CDATA[".$v['description']."]]></Description>
              <PicUrl><![CDATA[".$v['picUrl']."]]></PicUrl>
              <Url><![CDATA[".$v['url']."]]></Url>
              </item>";
            }

            $template .="</Articles>
            </xml> ";
            echo sprintf($template, $toUser, $fromUser, time(), 'news');

            //注意：进行多图文发送时，子图文个数不能超过10个
        }