PHP编程：微信公众平台开发关注及取消关注事件的方法

define("TOKEN","w3note");//定义识别码
$wechatObj = new wechatCallbackapiTest();//实例化wechatCallbackapiTest类
?
if(!isset($_GET["echostr"])){
???? $wechatObj->responseMsg();
}else{
?$wechatObj->valid();
}
class wechatCallbackapiTest
{
?public function valid()
??? {
??????? $echoStr = $_GET["echostr"];
??????? if($this->checkSignature()){
???????? echo $echoStr;
???????? exit;
??????? }
??? }
??? public function responseMsg()//执行接收器办法
??? {
??? $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";//这里是向关注者发送的提示信息
??? 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;
? }
?}
}