[1] 微信公众号与sae的web应用之间的配置

第一步：申请sae账号，并新建web应用。

第二步：下载http://mp.weixin.qq.com/mpres/htmledition/res/wx_sample.20140819.zip压缩包，并上传到sae服务器中。

第三步：配置微信公众号接口：

输入接口配置信息，填写URL和Token。点击提交按钮。

※ 此时会发现配置不成功！

需要在代码中添加：header('content-type:text');

全部代码如下：

<?php
/**
  * wechat php test
  */

//define your token
define("TOKEN", "hypo");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->valid();

class wechatCallbackapiTest
{
 public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
            header('content-type:text');
         　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)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
               $postObj = simplexml_load_string($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";
                 $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()
 {
        // you must define TOKEN by yourself
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }
       
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
          
  $token = TOKEN;
  $tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
  sort($tmpArr, SORT_STRING);
  $tmpStr = implode( $tmpArr );
  $tmpStr = sha1( $tmpStr );
  
  if( $tmpStr == $signature ){
   return true;
  }else{
   return false;
  }
 }
}

?>