php微信开发之关键词回复功能

<?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;
 }
 }
}

?>