?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"){
   $contentStr = "最新資訊：《環境違法行為舉報獎勵辦法》";}
   if($keyword=="3"){
   $contentStr = "31離婚協議\n32租房合同\n33交通事故協議書";}   
   $resultStr = sprintf($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;
 }
 }
}

?>