<?php
/**
  * wechat php test
  */

//define your token
require_once "common.php";
//这里是引入curl发送函数的类
require_once ‘WeChat.class.php‘;
define("TOKEN", "twgdh");

//这里让这个类继承了curl发送参数的类
class wechatCallbackapiTest extends WeChat
{
    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
        //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 */
                // 使用simplexml技术对xml进行解析 
                // libxml_disable_entity_loader(true), 是从安全性考虑，为了防止xml外部注入，
                //只对xml内部实体内容进行解析
                libxml_disable_entity_loader(true);
                //加载 postStr 字符串
                  $postObj = simplexml_load_string($postStr, ‘SimpleXMLElement‘, LIBXML_NOCDATA);            
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                global $tmp_arr;
                
                //根据接收到的消息类型，来进行分支处理(switch)
                switch($postObj->MsgType)
                {
                    case ‘event‘:
                        //用户未关注时，进行关注后的事件推送
                        if($postObj->Event == ‘subscribe‘)
                        {
                            
                            $contentStr = "夺命雷公狗欢迎您!, 您已经加入到 {$gid}";
                            $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                            echo $resultStr; 
                        }else if($postObj->Event == ‘LOCATION‘)
                        {
                            //取出该用户上报的经度和纬度
                            $Latitude = $postObj->Latitude;//纬度
                            $Longitude = $postObj->Longitude;//经度
                            //现在是每隔5秒自动返回的
                            $contentStr = "您目前的地理位置是\n\n纬度是：{$Latitude}\n\n经度是：{$Longitude}";
                            $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                            echo $resultStr; 
                        }
                        break;
                    case ‘text‘:
                        //回复文本模板
                        if(!empty($keyword))
                        {

                            $contentStr = "夺命雷公狗平台已经收到您的问题, 稍后回复您!";
                            $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                            echo $resultStr;
                            
                        }
                        else{
                            $contentStr = "您输入的格式不正确";
                            $resultStr = sprintf($tmp_arr[‘text‘], $fromUsername, $toUsername, $time, $contentStr);
                            echo $resultStr;
                        }
                        break;
                    //default:
                }
        }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;
        }
    }
}

//如果这段代码放在上面，那程序将会报错，因为继承的问题，会显示类没有找到
$wechatObj = new wechatCallbackapiTest();
//当接入成功后，请注销这句话，否则，会反复验证。
//$wechatObj->valid();
//添加响应请求的语句
$wechatObj->responseMsg();

?>