public function responseMsg(){
  
 //get post data, May be due to the different environments
  $postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信发来的XML数据

  //extract post data
 if(!empty($postStr)){
    
   //解析post来的XML为一个对象$postObj
   $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
  
   $fromUsername = $postObj->FromUserName; //请求消息的用户
   $toUsername = $postObj->ToUserName; //"我"（订阅号）的公众号id
   $keyword = trim($postObj->Content); //用户发给订阅号的消息内容
   $time = time(); //时间戳
   $msgtype = 'text'; //消息类型：文本
   $textTpl = "
  
  
  %s
  
  
  ";

   if($postObj->MsgType == 'event'){ //如果XML信息里消息类型为event
    if($postObj->Event == 'subscribe'){ //如果是订阅事件
     $contentStr = "欢迎订阅misaka去年夏天！\n更多精彩内容：http://blog.csdn.net/misakaqunianxiatian";
     $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);
     echo $resultStr;
     exit();
    }
   }

   $which = mb_substr($keyword, 0, 2, 'UTF-8');//获取要返回什么样的信息

   if($which== "翻译"){ //如果要进行翻译
    $fanyi = $which;
    $search = str_replace($fanyi, '', $keyword); //要翻译的关键字

    $key = ""; //在有道API申请的key
    $keyfrom = ""; //与key对应
    $url = 'http://fanyi.youdao.com/openapi.do?keyfrom=' . $keyfrom . '&key=' . $key . '&type=data&doctype=json&version=1.1&q=' . urlencode($search);//调用有道翻译API
    
    $json = file_get_contents($url);//也可以用curl来获取
    $res = json_decode($json, true);

    /**
     * 以下从返回的数据中提取翻译结果
     */
    $contentStr = '【查询】' . $res['query'] . "\n";
    $contentStr .= "【翻译】\n" . $res['translation'][0] . "\n";

    $str = '';
    foreach($res['basic']['explains'] as $v){
     $str .= $v . "\n";
    }
    $contentStr .= "【基本释义】\n" . $str;


    if(isset($res['web'])){

     foreach($res['web'] as $kk=>$vv){
      sort($vv);
      $res['web'][$kk] = $vv; //调节字段顺序
     }

     $str = '';
     foreach($res['web'] as $v){
      foreach($v as $k2=>$v2){
       if($k2 == 0){
        $str .= "【". $v2 ."】\n";
       }else{
        foreach($v2 as $v3){
         $str .= $v3 ."\n";
        }
       }
      }
     }
     $contentStr .= "【网络释义】\n" . $str;     
    }

    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);
    echo $resultStr;
    exit(); 

   }