php微信开发之音乐回复功能

<?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;
    $keyword = trim($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(!empty( $keyword ))
    {
     $msgtype = "text";
     if($keyword=="1"){
     $contentstr = "qiphon";}
     if($keyword=="2"){
     $contentstr = "最新资讯：《环境违法行为举报奖励办法》";}
     if($keyword=="3"){
     $contentstr = "31离婚协议\n32租房合同\n33交通事故协议书";}     
     $resultstr = sprintf($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;
  }
 }
}

?>