微信消息管理之被动回复用户消息

当用户发送消息给公众号时（或某些特定的用户操作引发的事件推送时），会产生一个POST请求，开发者可以在响应包（Get）中返回特定XML结构，来对该消息进行响应（现支持回复文本、图片、图文、语音、视频、音乐）。严格来说，发送被动响应消息其实并不是一种接口，而是对微信服务器发过来消息的一次回复。

首先处理用户发过来的消息,然后根据消息服务器做出相应的响应。

public function responseMsg(){
    //get post data, May be due to the different environments
    $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];   //用户端发来的数据
    
    //if (!empty($postStr)){
    /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
       the best way is to check the validity of xml by yourself */
    libxml_disable_entity_loader(true);
    //通过simplexml进行数据解析,转换为对象
    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);   
    
    
    switch($postObj->MsgType){              //用户发送的消息类型
         case "event": 
            $this->_doEvent($postObj); 
            break;
         case "text": 
            $this->_doText($postObj); 
            break;
         case "image": 
            $this->_doImage($postObj); 
            break;
         case "voice": 
            $this->_doVoice($postObj); 
            break;
         case "music": 
            $this->_doMusic($postObj); 
            break;
        case "location": 
            $this->_doLocation($postObj); 
            break;
         default: 
            break;
    }  
           
}

1.文本消息

//文本消息
private function _doText($postObj){
    
    $fromUsername = $postObj->FromUserName;
    $toUsername = $postObj->ToUserName;
    $keyword = trim($postObj->Content);
    $time = time();
    $textTpl = "<xml>
                <ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[%s]]></MsgType>
                <Content><![CDATA[%s]]></Content>
                <FuncFlag>0</FuncFlag>
                </xml>";             
    $msgType = "text";
    
    switch($keyword){
        case '初音科技':
            $contentStr = "提供一流的技术支持!!";
            break;
        case 'PHP':
            $contentStr = "最美的语言!!";
            break;
        case '图文':
            $newsArr = array(
                    array(
                    'Title'=>'初音科技,专为高端网络定制',
                    'Description'=>'初音科技,做一个品牌影响一个行业!',
                    'PicUrl'=>'http://edu.zbxiaochengxu.com/o_1b9pjfv6i1111gp69pp1m45sd7q.jpg',
                    'Url'=>'http://mp.weixin.qq.com/s?__biz=MzA4NTkzMzI0Ng==∣=2652036751&idx=2&sn=641c21e3831c094cdaf40e115c9eaee6&scene=0#wechat_redirect',
                ),
                array(
                    'Title'=>'初音科技,专为高端网络定制',
                    'Description'=>'初音科技,做一个品牌影响一个行业!',
                    'PicUrl'=>'http://qfenxiang.chuyin.net.cn/weixinopen/images/0.jpg',
                    'Url'=>'http://mp.weixin.qq.com/s?__biz=MzA4NTkzMzI0Ng==∣=2652036751&idx=2&sn=641c21e3831c094cdaf40e115c9eaee6&scene=0#wechat_redirect',
                )
            );
            $this->_replayNews($postObj,$newsArr); 
            break;
        default:
            $contentStr = "启军测试微信公众号响应!!";
            break;
    } 
    
    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
    echo $resultStr;    
}

2.图片消息

//回复图片消息
private function _doImage($postObj,$mediaId){
    
    //$contentStr = "您发送的是图片信息!消息类型为:".$postObj->PicUrl."\nMediaId为:".$postObj->MediaId;
    if( $postObj->MsgType == 'image'){
        $mediaId = $postObj->MediaId;
    }
    
    $fromUsername = $postObj->FromUserName;
    $toUsername = $postObj->ToUserName;
    $time = time();
    $imageTpl = "<xml>
                <ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[%s]]></MsgType>
                <Image>
                <MediaId><![CDATA[%s]]></MediaId>
                </Image>
                </xml>";
    $msgType = "image";
    
    //$this->_replayText($postObj,$contentStr);
    $resultStr = sprintf($imageTpl,$fromUsername,$toUsername,$time,$msgType,$mediaId);
    echo $resultStr;
}

3.语音消息

//回复语音消息
private function _doVoice($postObj,$mediaId){
    
    
    if( $postObj->MsgType == 'voice'){
        //$mediaId = $postObj->MediaId;
        $contentStr = "您发送的是语音信息!\n你说的是:".$postObj->Recognition;
        $this->_replayText($postObj,$contentStr);
        exit();
    }
    
    $fromUsername = $postObj->FromUserName;
    $toUsername = $postObj->ToUserName;
    $time = time();
    $voiceTpl = "<xml>
                <ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[%s]]></MsgType>
                <Voice>
                <MediaId><![CDATA[%s]]></MediaId>
                </Voice>
                </xml>";
    $msgType = "voice";
    
    $resultStr = sprintf($voiceTpl,$fromUsername,$toUsername,$time,$msgType,$mediaId);
    echo $resultStr;
    
}

4.音乐消息

//音乐消息

private function _doMusic($postObj){

$fromUsername = $postObj->FromUserName;
$toUsername = $postObj->ToUserName;
$time = time();
$musicTpl = "<xml>
            <ToUserName><![CDATA[%s]]></ToUserName>
            <FromUserName><![CDATA[%s]]></FromUserName>
            <CreateTime>%s</CreateTime>
            <MsgType><![CDATA[%s]]></MsgType>
            <Music>
            <Title><![CDATA[%s]]></Title>
            <Description><![CDATA[%s]]></Description>
            <MusicUrl><![CDATA[%s]]></MusicUrl>
            <HQMusicUrl><![CDATA[%s]]></HQMusicUrl>
            </Music>
            </xml>";             
$msgType = "music";
$title = "还魂门";
$desc = "电视剧<老九门>主题曲";
$url = "http://qfenxiang.chuyin.net.cn/weixinopen/musics/music.mp3";
$hqurl = "http://qfenxiang.chuyin.net.cn/weixinopen/musics/music.mp3";
    
$resultStr = sprintf($musicTpl,$fromUsername,$toUsername,$time,$msgType,$title,$desc,$url,$hqurl,$contentStr);
echo $resultStr;

}

5.图文消息

//[封装]图文回复
private function _replayNews($postObj,$newsArr){
    
    if( !is_array($newsArr) || sizeof($newsArr)<1 ){
        $newsArr = array(
            array(
                'Title'=>'全民创业蒙的就是你，来一盆冷水吧！',
                'Description'=>'全民创业已经如火如荼，然而创业是一个非常自我的过程，它是一种生活方式的选择。从外部的推动有助于提高创业的存活率，但是未必能够提高创新的成功率。',
                'PicUrl'=>'http://yun.topthink.com/Uploads/Editor/2015-07-30/55b991cad4c48.jpg',
                'Url'=>'http://www.topthink.com/topic/11991.html',
            )
        );
    }
    
    $itemStr = '';
    foreach($newsArr as $item){
        $newsData = '<item>
                        <Title><![CDATA[%s]]></Title> 
                        <Description><![CDATA[%s]]></Description>
                        <PicUrl><![CDATA[%s]]></PicUrl>
                        <Url><![CDATA[%s]]></Url>
                    </item>';
        $itemStr .= sprintf($newsData,$item['Title'],$item['Description'],$item['PicUrl'],$item['Url']);
    }
    
    $fromUsername = $postObj->FromUserName;
    $toUsername = $postObj->ToUserName;
    $time = time();
    $newsTpl = '<xml>
                <ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[%s]]></MsgType>
                <ArticleCount>%s</ArticleCount>
                <Articles>'.$itemStr.'</Articles>
                </xml>';
    $msgType = 'news';
    $count = count($newsArr);
    
    $resultStr = sprintf($newsTpl,$fromUsername,$toUsername,$time,$msgType,$count,$str);
    echo $resultStr;    
}