?php
/**
 * wechat php test
 */

//define your token
define("TOKEN", "jiekou");
$wechatObj = new wechatCallbackapiTest();
$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 ))
        {
          $msgType = "text";
          switch ($keyword)
          {
          case "1";
          $contentStr = "公司簡介!";
          break;
          case "2";
          $contentStr = "最新優(yōu)惠!";
          break;
          default;
          $contentStr = "歡迎光臨!";

          }

          $resultStr = sprintf($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;
    }
  }
}

?>