$postObj = simplexml_load_string($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[news]]>/MsgType>
      ArticleCount>3/ArticleCount>
      Articles>
      item>
        Title>![CDATA[%s]]>/Title> 
        Description>![CDATA[s]]>/Description>
        PicUrl>![CDATA[url]]>/PicUrl>
       Url>![CDATA[url]]>/Url>
      /item>
     item>
    Title>![CDATA[%s]]>/Title>
    Description>![CDATA[s]]>/Description>
    PicUrl>![CDATA[url]]>/PicUrl>
    Url>![CDATA[url]]>/Url>
    /item>
     item>
       Title>![CDATA[%s]]>/Title>
       Description>![CDATA[s]]>/Description>
       PicUrl>![CDATA[url]]>/PicUrl>
       Url>![CDATA[url]]>/Url>
     /item>
    /Articles>
   FuncFlag>1/FuncFlag>
  /xml>";    

 $url="http://222.206.65.12/opac/search_rss.php?dept=ALLtitle={$keyword}doctype=ALLlang_code=ALLmatch_flag=forwarddisplaypg=20showmode=listorderby=DESCsort=CATA_DATEonlylendable=no";

 $fa=file_get_contents($url);
 $f=simplexml_load_string($fa);
 $da1=$f->channel->item[0]->title;
 $da2=$f->channel->item[1]->title;
 $da3=$f->channel->item[2]->title;  

 $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time,$da1,$da2,$da3);
echo $resultStr;

?php
/**
 * wechat php test
 */

//define your token
define("TOKEN", "weixin");
$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[news]]>/MsgType>
        ArticleCount>3/ArticleCount>
        Articles>
         item>
          Title>![CDATA[%s]]>/Title> 
          Description>![CDATA[s]]>/Description>
          PicUrl>![CDATA[url]]>/PicUrl>
          Url>![CDATA[url]]>/Url>
         /item>
         item>
          Title>![CDATA[%s]]>/Title>
          Description>![CDATA[s]]>/Description>
          PicUrl>![CDATA[url]]>/PicUrl>
          Url>![CDATA[url]]>/Url>
         /item>
         item>
          Title>![CDATA[%s]]>/Title>
          Description>![CDATA[s]]>/Description>
          PicUrl>![CDATA[url]]>/PicUrl>
          Url>![CDATA[url]]>/Url>
         /item>
        /Articles>
        FuncFlag>1/FuncFlag>
       /xml>";    

     $url="http://222.206.65.12/opac/search_rss.php?dept=ALLtitle={$keyword}doctype=ALLlang_code=ALLmatch_flag=forwarddisplaypg=20showmode=listorderby=DESCsort=CATA_DATEonlylendable=no";

     $fa=file_get_contents($url);
     $f=simplexml_load_string($fa);
     $da1=$f->channel->item[0]->title;
     $da2=$f->channel->item[1]->title;
     $da3=$f->channel->item[2]->title;  

     $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time,$da1,$da2,$da3);
     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;
  }
 }
}

?>