$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
        $fromUsername = $postObj->FromUserName;
        $toUsername = $postObj->ToUserName;
        $type = $postObj->MsgType;
        $customrevent = $postObj->Event;
        $latitude = $postObj->Location_X;
        $longitude = $postObj->Location_Y;
        $keyword = trim($postObj->Content);
        $time = time();
        $textTpl = "xml>
              ToUserName>![CDATA[%s]]>/ToUserName>
              FromUserName>![CDATA[%s]]>/FromUserName>
              CreateTime>%s/CreateTime>
              MsgType>![CDATA[%s]]>/MsgType>
              Content>![CDATA[%s]]>/Content>
              FuncFlag>0/FuncFlag>
              /xml>";       
        switch ($type)
        { 
        case "text";
          $status=array('0'=>'查询出错','1'=>'暂无记录','2'=>'在途中','3'=>'派送中','4'=>'已签收','5'=>'拒收','6'=>'疑难件','7'=>'退回');//构建快递状态数组
          $kuaidiurl="http://www.aikuaidi.cn/rest/?key=ff4735a30a7a4e5a8637146fd0e7cec9order={$keyword}id=shentongshow=xml";//快递地址
          $kuaidistr=file_get_contents($kuaidiurl);//读入文件
          $kuaidiobj=simplexml_load_string($kuaidistr);//xml解析
          $kuaidistatus = $kuaidiobj->Status;//获取快递状态
          $kuaistr=strval($kuaidistatus);//对象转换为字符串
          $contentStr0 =$status[$kuaistr];//根据数组返回
          foreach ($kuaidiobj->Data->Order as $a)
          {  
            foreach ($a->Time as $b)
            {
              foreach ($a->Content as $c)
              {
                $m.="{$b}{$c}";}
              }
          }
          //遍历获取快递时间和事件
          $contentStr="你的快递单号{$keyword}{$contentStr0}{$m}";
          break;         
        default;
          $contentStr ="此项功能尚未开发";  
        }
        $msgType="text";
        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
        echo $resultStr;

?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;
        $customrevent = $postObj->Event;
        $latitude = $postObj->Location_X;
        $longitude = $postObj->Location_Y;
        $keyword = trim($postObj->Content);
        $time = time();
        $textTpl = "xml>
              ToUserName>![CDATA[%s]]>/ToUserName>
              FromUserName>![CDATA[%s]]>/FromUserName>
              CreateTime>%s/CreateTime>
              MsgType>![CDATA[%s]]>/MsgType>
              Content>![CDATA[%s]]>/Content>
              FuncFlag>0/FuncFlag>
              /xml>";       
        switch ($type)
        { 
        case "text";
          $status=array('0'=>'查询出错','1'=>'暂无记录','2'=>'在途中','3'=>'派送中','4'=>'已签收','5'=>'拒收','6'=>'疑难件','7'=>'退回');//构建快递状态数组
          $kuaidiurl="http://www.aikuaidi.cn/rest/?key=ff4735a30a7a4e5a8637146fd0e7cec9order={$keyword}id=shentongshow=xml";//快递地址
          $kuaidistr=file_get_contents($kuaidiurl);//读入文件
          $kuaidiobj=simplexml_load_string($kuaidistr);//xml解析
          $kuaidistatus = $kuaidiobj->Status;//获取快递状态
          $kuaistr=strval($kuaidistatus);//对象转换为字符串
          $contentStr0 =$status[$kuaistr];//根据数组返回
          foreach ($kuaidiobj->Data->Order as $a)
          {  
            foreach ($a->Time as $b)
            {
              foreach ($a->Content as $c)
              {
                $m.="{$b}{$c}";}
              }
          }
          //遍历获取快递时间和事件
          $contentStr="你的快递单号{$keyword}{$contentStr0}{$m}";
          break;         
        default;
          $contentStr ="此项功能尚未开发";  
        }
        $msgType="text";
        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
        echo $resultStr;

    }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;
    }
  }
}

?>