php微信开发之关注事件

?php
/**
 * wechat php test
 */

//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
//$wechatObj->valid();
$wechatObj->responseMsg();
class wechatCallbackapiTest
{
 public function valid()
 {
  $echoStr = $_GET["echostr"];

  //valid signature , option
  if($this->checkSignature()){
   echo $echoStr;
   exit;
  }
 }

 public function responseMsg()
 {
  //get post data, May be due to the different environments
  $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

  //extract post data
  if (!empty($postStr)){

    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
    $fromUsername = $postObj->FromUserName;
    $toUsername = $postObj->ToUserName;
    $type = $postObj->MsgType;
    $customevent = $postObj->Event;
    $keyword = trim($postObj->Content);
    $time = time();
    $textTpl = "xml>
       ToUserName>![CDATA[%s]]>/ToUserName>
       FromUserName>![CDATA[%s]]>/FromUserName>
       CreateTime>%s/CreateTime>
       MsgType>![CDATA[%s]]>/MsgType>
       Content>![CDATA[%s]]>/Content>
       FuncFlag>0/FuncFlag>
       /xml>";    
    if($type=="event" and $customrevent=="subscribe"){
     $contentStr = "感谢你的关注\n回复1查看联系方式\n回复2查看最新资讯\n回复3查看法律文书";
     $msgType = "text";
     $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
     echo $resultStr;
     } 
    if(!empty( $keyword ))
    {        
     $msgType = "text";
     if($keyword=="1"){
     $contentStr = "qiphon";}
     if($keyword=="2"){
     $contentStr = "test 。";}
     if($keyword=="3"){
     $contentStr = "test333";}     
     $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
     echo $resultStr;
    }else{
     echo "Input something...";
    }

  }else {
   echo "";
   exit;
  }
 }

 private function checkSignature()
 {
  $signature = $_GET["signature"];
  $timestamp = $_GET["timestamp"];
  $nonce = $_GET["nonce"]; 

  $token = TOKEN;
  $tmpArr = array($token, $timestamp, $nonce);
  sort($tmpArr);
  $tmpStr = implode( $tmpArr );
  $tmpStr = sha1( $tmpStr );

  if( $tmpStr == $signature ){
   return true;
  }else{
   return false;
  }
 }
}

?>