微信公众号三方平台开发【代微信公众号接收消息事件并响应】

今天要讲的是代微信公众号接收消息并进行回复，这里要用到的就是咱们之前在微信公众号三方平台开发【帐号注册、平台创建】里写到的“公众号消息与事件接收URL”，在接收的目标方法里，我们首先要获取到微信推送过来post数据（xml格式），然后对其进行解密操作，从而得到消息内容。

这里我们会用到微信公众号三方平台开发【component_verify_ticket篇】里同样的解密方法进行数据的加解密操作，如下：

require_once(dirname(FILE).'/wxBizMsgCrypt.php');
//encodingAesKey和token均为申请三方平台是所填写的内容
$encodingAesKey = '公众号消息加解密Key';
$token = '公众号消息校验Token';
$appId = '三方平台appid';
$timeStamp = empty ( $_GET ['timestamp'] ) ? "" : trim ($_GET ['timestamp'] );
$nonce = empty ( $_GET ['nonce'] ) ? "" : trim ( $_GET['nonce'] );
$msg_sign = empty ( $_GET ['msg_signature'] ) ? "" : trim( $_GET ['msg_signature'] );
$pc = new \WXBizMsgCrypt ( $token, $encodingAesKey, $appId );
//获取到微信推送过来post数据（xml格式）
$postArr = $GLOBALS['HTTP_RAW_POST_DATA'];
$msg = '';
$errCode= $pc->decryptMsg($msg_sign, $timeStamp, $nonce, $postArr,$msg);

解密后，当$errCode返回值为0时，代表解密成功，下一步我们就需要对消息进行解析处理：

$postObj =simplexml_load_string($msg,'SimpleXMLElement',LIBXML_NOCDATA);

然后，根据不同的消息类型做出相应的回复，当消息类型为“event”且为用户关注事件时，微信公众号给用户自动回复一个文本消息：

if (strtolower($postObj -> MsgType) == 'event'){
//如果是关注subscribe事件
if(strtolower($postObj->Event == 'subscribe')){
$public_name= strval($postObj->ToUserName);
$map['public_name']=$public_name;
$cont =M('Subscribe')->where($map)->find();
//回复用户消息
$content =$cont['content'];
responseText($postObj,$content);
}
}

根据关键字回复图文消息：

if(strtolower($postObj -> MsgType) == 'text' &&trim($postObj->Content)=='图文'){
//这一步可从数据库中查询得到
$arr = array(
array(
'title'=> 'test1',
'description'=> 'test1',
'picUrl'=>'http://mmbiz.qpic.cn/mmbiz/mLiaE7fSUysSbbqzicX2LVsLL1HsXMRV0m6uicfiaSX9Aic43BA5vnpFOBMWAoEuaVDicoOX4HzGT8OT5QK6DRs14VkQ/0',
'url'=>'https://mp.weixin.qq.com/s?__biz=MjM5NzY4MDc0MA==&tempkey=mKI6U0rlJZofvceyQdxTPAYtneMxKyhWy52ytbUZfOJzFEHMDqmYTQLQWrkrSRky&appmsgid=10000002&itemidx=1&sign=99baf31f45e2357af575c63b5b303b6a#wechat_redirect',
),
array(
'title'=> 'test2',
'description'=> 'test2',
'picUrl'=> 'http://mmbiz.qpic.cn/mmbiz_jpg/mLiaE7fSUysTFDEZQTOvXleYwYqFN1JeLwM66Zg7dHjK3aHQxdVtwGTJgzuKJRuZCBHljIvVLkvZ2CADJ6paJYQ/0?wx_fmt=jpeg',
'url'=>'https://mp.weixin.qq.com/s?__biz=MjM5NzY4MDc0MA==&tempkey=mKI6U0rlJZofvceyQdxTPDXw5wcPw4rpHzkwOv4U7kDY1V%2BUUirAB0C9oEEsX5HQB8Uv1Ut2zj3buNkRPh6KNYWVyTaxebMkb8IcD9FjNbpcqY0mdRbCxRnbIjtmNBd37cKXm3Egbo1KWdkSEy5NZg%3D%3D&chksm=315123030626aa15c3e454afbd931ec3458149b13370999b16bc72b876326977e7d68b406a8c#rd',
)
);
responseNews($postObj,$arr);
}

其他关键字回复：

$public_name= strval($postObj->ToUserName);
$keyword = strval(trim($postObj-> Content));
$log['public_name']=$public_name;
$log['keyword'] =array('like','%'.$keyword.'%');
$con =M('Keyword')->where($log)->select();
foreach ($con as $vo=> $k){
$conn=$con[$vo]['content'];
}
if($conn){
$content =$conn;
}else{
$lg['public_name']=$public_name;
$lg['keyword']='';
$con =M('Keyword')->where($lg)->select();
foreach($con as $vo => $k){
$conn=$con[$vo]['content'];
}
$content =$conn;
}
responseText($postObj,$content);

以上用到的responseText（）、responseNews（）鉴于代码模块化，而且方便复用，所以单独用方法写出，其他不多说了，具体见代码：

1）回复文本消息

function responseText($postObj,$content){
      $template ="
          
          
          %s
          
          
        ";
     $fromUser = $postObj ->ToUserName;
     $toUser = $postObj -> FromUserName;
     $time = time();
     $msgType = 'text';
    $res =sprintf($template,$toUser,$fromUser,$time,$msgType,$content);
     $encodingAesKey = '公众号消息加解密Key';
     $token ='公众号消息校验Token';
     $appId = '三方平台appid';
     $pc = new \WXBizMsgCrypt ($token, $encodingAesKey, $appId );
     $encryptMsg = '';
   $errCode =$pc->encryptMsg($res,$_GET ['timestamp'], $_GET ['nonce'], $encryptMsg);
     if($errCode ==0){
          $res = $encryptMsg;
      }
     echo $res;
     }

2）回复图文消息

function responseNews($postObj,$arr){
     $toUser = $postObj -> FromUserName;
     $fromUser = $postObj -> ToUserName;
     $template ="
          
          
          %s
          
          ".count($arr)."
          ;
     foreach($arr as $k=>$v){
          $template.="
            
           
            
            
            ";
}
          $template.="
          ";
     $time = time();
     $msgType = 'news';
     $res =sprintf($template,$toUser,$fromUser,$time,$msgType);
     $encodingAesKey = '公众号消息加解密Key';
     $token ='公众号消息校验Token';
     $appId = '三方平台appid';
     $pc = new \WXBizMsgCrypt ($token, $encodingAesKey, $appId );
     $encryptMsg = '';
   $errCode =$pc->encryptMsg($res,$_GET ['timestamp'], $_GET ['nonce'], $encryptMsg);
     if($errCode ==0){
          $res = $encryptMsg;
      }
     echo $res;
     }

需要注意的是，在代微信公众号实现其功能的时候，接收的消息都需要解密，对回复的内容也必须进行加密再进行回复。

接收消息事件完整代码：

public function reponseMsg(){
require_once(dirname(FILE).'/wxBizMsgCrypt.php');
//encodingAesKey和token均为申请三方平台是所填写的内容
$encodingAesKey = '公众号消息加解密Key';
$token = '公众号消息校验Token';
$appId = '三方平台appid';
$timeStamp = empty ($_GET ['timestamp'] ) ? "" : trim ( $_GET ['timestamp'] );
$nonce = empty ( $_GET['nonce'] ) ? "" : trim ( $_GET ['nonce'] );
$msg_sign = empty ($_GET ['msg_signature'] ) ? "" : trim ( $_GET ['msg_signature'] );
$pc = new\WXBizMsgCrypt ( $token, $encodingAesKey, $appId );
//获取到微信推送过来post数据（xml格式）
$postArr =$GLOBALS['HTTP_RAW_POST_DATA'];
$msg = '';
$errCode =$pc->decryptMsg($msg_sign, $timeStamp, $nonce, $postArr,$msg);
if($errCode == 0){
//处理消息类型，并设置回复类型和内容
$postObj =simplexml_load_string($msg,'SimpleXMLElement',LIBXML_NOCDATA);
//判断该数据包是否是订阅（用户关注）的事件推送
if(strtolower($postObj -> MsgType) == 'event'){
//如果是关注subscribe事件
if(strtolower($postObj->Event == 'subscribe')){
$public_name= strval($postObj->ToUserName);
$map['public_name']=$public_name;
$cont= M('Subscribe')->where($map)->find();
//回复用户消息
$content= $cont['content'];
responseText($postObj,$content);
}
}
//用户发送某一图文关键字的时候，回复图文消息
if(strtolower($postObj-> MsgType) == 'text' && trim($postObj->Content)=='图文'){
//这一步可从数据库中查询得到
$arr= array(
array(
'title'=> 'test1',
'description'=> 'test1',
'picUrl'=>'http://mmbiz.qpic.cn/mmbiz/mLiaE7fSUysSbbqzicX2LVsLL1HsXMRV0m6uicfiaSX9Aic43BA5vnpFOBMWAoEuaVDicoOX4HzGT8OT5QK6DRs14VkQ/0',
'url'=>'https://mp.weixin.qq.com/s?__biz=MjM5NzY4MDc0MA==&tempkey=mKI6U0rlJZofvceyQdxTPAYtneMxKyhWy52ytbUZfOJzFEHMDqmYTQLQWrkrSRky&appmsgid=10000002&itemidx=1&sign=99baf31f45e2357af575c63b5b303b6a#wechat_redirect',
),
array(
'title'=> 'test2',
'description'=> 'test2',
'picUrl'=> 'http://mmbiz.qpic.cn/mmbiz_jpg/mLiaE7fSUysTFDEZQTOvXleYwYqFN1JeLwM66Zg7dHjK3aHQxdVtwGTJgzuKJRuZCBHljIvVLkvZ2CADJ6paJYQ/0?wx_fmt=jpeg',
'url'=>'https://mp.weixin.qq.com/s?__biz=MjM5NzY4MDc0MA==&tempkey=mKI6U0rlJZofvceyQdxTPDXw5wcPw4rpHzkwOv4U7kDY1V%2BUUirAB0C9oEEsX5HQB8Uv1Ut2zj3buNkRPh6KNYWVyTaxebMkb8IcD9FjNbpcqY0mdRbCxRnbIjtmNBd37cKXm3Egbo1KWdkSEy5NZg%3D%3D&chksm=315123030626aa15c3e454afbd931ec3458149b13370999b16bc72b876326977e7d68b406a8c#rd',
)
);
responseNews($postObj,$arr);
}else{
//当微信用户发送关键字，公众号回复对应内容
$public_name=strval($postObj->ToUserName);
$keyword= strval(trim($postObj -> Content));
$log['public_name']=$public_name;
$log['keyword']= array('like','%'.$keyword.'%');
$con= M('Keyword')->where($log)->select();
foreach($con as $vo => $k){
$conn=$con[$vo]['content'];
}
if($conn){
$content= $conn;
}else{
$lg['public_name']=$public_name;
$lg['keyword']='';
$con= M('Keyword')->where($lg)->select();
foreach($con as $vo => $k){
$conn=$con[$vo]['content'];
}
$content= $conn;
}
responseText($postObj,$content);
}
}
}