Methods for developing follow and unfollow events on WeChat public platform, public platform

Methods for developing follow and unfollow events on WeChat public platform, public platform_PHP tutorial

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Release： 2016-07-13 10:11:01

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WeChat public platform develops methods for following and unfollowing events, public platform

The example in this article describes the method of developing follow and unfollow events on the WeChat public platform. Share it with everyone for your reference. The specific analysis is as follows:

When a user follows or unfollows a public account, WeChat will push this event to the URL filled in by the developer, so that the developer can send a welcome message to the user or unbind the account.

The following is an example of following and unfollowing on the WeChat public platform. The code is as follows:

Copy code The code is as follows:

define("TOKEN", "w3note");//Define identification code
$wechatObj = new wechatCallbackapiTest();//Instantiate the wechatCallbackapiTest class

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()//Execute the receiver method
{
$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 = "Welcome to follow the blog";//Here is the prompt message sent to followers
Break;
case "unsubscribe":
$content = "";
Break;
}
$result = $this->transmitText($object,$content);
Return $result;
}
private function transmitText($object,$content){
$textTpl = "
                                                                                                                                %s

0
        ";
$result = sprintf($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;
}
}
}

Code related parameter description:

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)

I hope this article will be helpful to everyone’s PHP programming design.