<?php
/**
 * wechat php test
 */
//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();
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 = $GLOBALS["HTTP_RAW_POST_DATA"];
    //extract post data
 if (!emptyempty($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(!emptyempty( $keyword ))
        {
        $msgType = "text";
         $contentStr = "Welcome to wechat world!";
         $resultStr = sprintf($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, SORT_STRING);
 $tmpStr = implode( $tmpArr );
 $tmpStr = sha1( $tmpStr );
 if( $tmpStr == $signature ){
  return true;
 }else{
  return false;
 }
 }
}
?>

//$wechatObj->valid();
$wechatObj->responseMsg();

<?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();
      $MsgType = $postObj->MsgType; //add
      $textTpl = "<xml>
        <ToUserName><![CDATA[%s]]></ToUserName>
        <FromUserName><![CDATA[%s]]></FromUserName>
        <CreateTime>%s</CreateTime>
        <MsgType><![CDATA[%s]]></MsgType>
        <Content><![CDATA[%s]]></Content>
        <FuncFlag>0</FuncFlag>
        </xml>";
      if($MsgType != 'event') {
        if(!empty( $keyword ))
        {
          $msgType = "text";
          $contentStr = "Welcome to wechat world!";
        }else{
          echo "Input something...";
        }
      } else {
        $msgType = "text";
        $contentStr = "感谢您关注AndyYang个人博客微信小助手。\r\n".
          "回复【1】返回两篇最新文章\r\n".
          "回复【2】返回两篇人气文章\r\n".
          "回复【3】返回两篇热评文章\r\n".
          "回复【4】返回两篇最新技术文章\r\n".
          "回复【5】返回两篇最新写作文章\r\n".
          "回复其他返回搜索关键字的两篇文章\r\n".
          "更多精彩内容，尽在：<a href='http://www.1sucai.cn'>www.1sucai.cn</a>。亲们，请多多支持哦，谢谢~";
        ;
      }
      $resultStr = sprintf($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, SORT_STRING); //这个在新的sdk中添加了第二个参数(compare items as strings)
    $tmpStr = implode( $tmpArr );
    $tmpStr = sha1( $tmpStr );
    if( $tmpStr == $signature ){
      return true;
    }else{
      return false;
    }
  }
}

<?php
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->weixin_run();
class wechatCallbackapiTest {
  private $fromUsername;
  private $toUsername;
  private $times;
  private $keyword;
  private $MsgType;
  public function responseMsg() {
 $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
 if (!emptyempty($postStr)) {
      $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
      $this->fromUsername = $postObj->FromUserName;
      $this->toUsername  = $postObj->ToUserName;
      $this->keyword   = trim($postObj->Content);
      $this->time     = time();
      $this->MsgType   = $postObj->MsgType;
    } else {
     echo "Pay attention to <a href='http://{$_SERVER['HTTP_HOST']}'>http://{$_SERVER['HTTP_HOST']}</a>,thanks!";
     exit;
    }
  }
  public function weixin_run() {
    $this->responseMsg();
    if($this->MsgType != 'event') { //attention
      $data = $this->getData();
     $this->fun_xml("news", $data, count($data));
    } else {
      $data = $this->getWelData();
     $this->fun_xml("text", $data, 1);
    }
  }
 //type: text 文本类型, news 图文类型
 //text,array(内容),array(ID)
 //news,array(array(标题,介绍,图片,超链接),...小于10条),条数
 private function fun_xml($type, $value_arr, $count) {
   $con="<xml>
   <ToUserName><![CDATA[{$this->fromUsername}]]></ToUserName>
   <FromUserName><![CDATA[{$this->toUsername}]]></FromUserName>
   <CreateTime>{$this->times}</CreateTime>
   <MsgType><![CDATA[{$type}]]></MsgType>";
    switch($type) {
     case "text" :
   $con.="<Content><![CDATA[$value_arr]]></Content>";
     break;
   case "news" :
   $con.="<ArticleCount>{$count}</ArticleCount>
    <Articles>";
   foreach($value_arr as $key => $v) {
      $con.="<item>
       <Title><![CDATA[{$v[0]}]]></Title>
       <Description><![CDATA[{$v[1]}]]></Description>
       <PicUrl><![CDATA[{$v[2]}]]></PicUrl>
       <Url><![CDATA[{$v[3]}]]></Url>
       </item>";
   }
   $con.="</Articles>";
     break;
   }
   echo $con."</xml>";
 }
  private function getData() {
    //数据库通过关键字查询文章
    //。。。。。。。。。。。。
    //。。。。。。。。。。。。
    //返回文章结果的数组
    return $data;
  }
  private function getWelData() {
    $data = "感谢您关注AndyYang个人博客微信小助手。\r\n".
          "回复【1】返回两篇最新文章\r\n".
          "回复【2】返回两篇人气文章\r\n".
          "回复【3】返回两篇热评文章\r\n".
          "回复【4】返回两篇最新技术文章\r\n".
          "回复【5】返回两篇最新写作文章\r\n".
          "回复其他返回搜索关键字的两篇文章\r\n".
          "更多精彩内容，尽在：<a href='http://www.1sucai.cn/'>www.1sucai.cn</a>。亲们，请多多支持哦，谢谢~";
        ;
    return $data;
  }
}