用户在关注与取消关注公众号时,微信会把这个事件推送到开发者填写的URL,方便开发者给用户下发欢迎消息或者做帐号的解绑.
下面是一个微信公众平台关注和取消关注的实例,代码如下:
- define("TOKEN", "w3note");
- $wechatObj = new wechatCallbackapiTest();
-
- if(!isset($_GET["echostr"])){
- $wechatObj->responseMsg();
- }else{
- $wechatObj->valid();
- }
- class wechatCallbackapiTest
- {
- public function valid()
- {
- $echoStr = $_GET["echostr"];
-
- if($this->checkSignature()){
- echo $echoStr;
- exit;
- }
- }
- public function responseMsg()
- {
-
- $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
-
- if (!emptyempty($postStr)){
-
- $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
- $RX_TYPE = trim($postObj->MsgType);
- switch($RX_TYPE){
- case "event":
- $result = $this->receiveEvent($postObj);
- breadk;
- }
- echo $result;
- }else{
- echo "";
- exit;
- }
- }
- private function receiveEvent($object){
- $content = "";
- switch ($postObj->Event){
- case "subscribe":
- $content = "欢迎关注网志博客";
- break;
- case "unsubscribe":
- $content = "";
- break;
- }
- $result = $this->transmitText($object,$content);
- return $result;
-
- }
- private function transmitText($object,$content){
- $textTpl = "<xml>
- <ToUserName><![CDATA[%s]]></ToUserName>
- <FromUserName><![CDATA[%s]]></FromUserName>
- <CreateTime>%s</CreateTime>
- <MsgType><![CDATA[text]]></MsgType>
- <Content><![CDATA[%s]]></Content>
- <FuncFlag>0</FuncFlag>
- </xml>";
- $result = sprintf($textTpl, $object->FromUserName, $object->$ToUserName, time(), $content);
- return $result;
-
- }
- private function checkSignature()
- {
- $signature = $_GET["signature"];
- $timestamp = $_GET["timestamp"];
- $nonce = $_GET["nonce"];
-
- $token = TOKEN;
- $tmpArr = array($token, $timestamp, $nonce);
- sort($tmpArr, SORT_STRING);
- $tmpStr = implode( $tmpArr );
- $tmpStr = sha1( $tmpStr );
-
- if( $tmpStr == $signature ){
- return true;
- }else{
- return false;
- }
- }
- }
代码相关参数说明:
参数 描述
ToUserName 开发者微信号
FromUserName 发送方帐号(一个OpenID)
CreateTime 消息创建时间 (整型)
MsgType 消息类型,event
Event 事件类型,subscribe(订阅)、unsubscribe(取消订阅) |