用戶在關注與取消關注公眾號時，微信會把這個事件推送到開發者填寫的URL。方便開發者給用戶下發歡迎消息或者做帳號的解綁

下面是一個微信公眾平臺關注和取消關注的實例:responseMsg();

} else {

$wechatObj->valid();

}

class wechatCallbackapiTest {

public function valid() {

$echoStr = $_GET["echostr"];

if ($this->checkSignature()) {

echo $echoStr;

exit;

}

}

public function responseMsg() //執行接收器方法

{

$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

if (!empty($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 = "歡迎關注網志博客"; //這里是向關注者發送的提示信息

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;

}

}

}

?>

代碼相關參數說明：

參數 描述

ToUserName 開發者微信號

FromUserName 發送方帳號(一個OpenID)

CreateTime 消息創建時間 (整型)

MsgType 消息類型，event

Event 事件類型，subscribe(訂閱)、unsubscribe(取消訂閱)

相關標簽：

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