微信公众服务响应脚本

很简单的被动回复脚本：

一般我们都用sdk： https://github.com/dodgepudding/wechat-php-sdk，自己写也是极好的，

<?php

// 微信与服务器通信安全监测
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[%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(){
            $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;
            }
    }
}



/**
  * wechat php 服务器
  */
//define your token
define("TOKEN", "token");
$wechatObj = new wechatCallbackapiTest();
$postObj = $GLOBALS["HTTP_RAW_POST_DATA"];
$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
$wechatObj->valid();