<?php
/**
 * 日志输出类
 */

class Logger {
    public static function writeTestLog($msg) {
        self::printLog(‘test‘, $msg);
    }


    public static function writeOnlineLog() {

    }

    public static function printLog($path, $msg) {
        $dir = ‘/disk/‘ . $path; //这里的路径是日志保存路径

        //判断目录是否存在  不存在则创建之
        if (file_exists($dir) === false) {
            mkdir($dir, 0777);
        }

        //Time:xxxIp:xxxMSG:xxx
        //得到客户端的IP地址
        //为了防止别人是通过代理进来的所以要想方法获取到对方的ip，这是一个通用的ip获取方法
        if (!empty($_SERVER[‘HTTP_CLIENT_IP‘])) {
            $ip = $_SERVER[‘HTTP_CLIENT_IP‘];
        } else if (!empty($_SERVER[‘HTTP_X_FORWARD_FOR‘])) {
            $ip = $_SERVER[‘HTTP_X_FORWARD_FOR‘];
        } else if (!empty($_SERVER[‘REMOTE_ADDR‘])) {
            $ip = $_SERVER[‘REMOTE_ADDR‘];
        }

        $filename = $dir . "/" . date(‘Ymd‘) . ".log";  //这里是日志保存在哪
        $f = fopen($filename, ‘ab‘); //用追加的方式打开
        $content = ‘Time:‘ . date(‘Y-m-d H:i:s‘) . " IP:" . $ip . " MSG:" . $msg; 
        //$content内容是Time：时间戳，IP：xxx，msg是传进的内容
        fwrite($f, $content);//写入内容
        fclose($f);//写入完成后关闭资源
    }
}

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

//包含日志类
require_once ‘core/Logger.class.php‘;

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

Logger::writeTestLog(json_encode($_GET));

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"];

        Logger::writeTestLog("postStr" . $postStr);

          //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";
                    
                    if ($keyword == ‘你好‘ or $keyword == ‘您好‘ or $keyword == ‘hello‘ or $keyword == ‘好‘) {
                        $contentStr = ‘您好！‘;
                    } else if ($keyword == ‘北京‘) {
                        $contentStr = ‘北京是*的首都！‘;
                    } else if (preg_match(‘/^.*天气.*$/‘, $keyword)) {
                        $contentStr = "北京今天天气不错，我们下午没有课！";
                    } else {
                        $contentStr = "感谢您对双哥PHP的关注与支持!"; //默认的回复
                    }
                    $resultStr = sprintf($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;
        }
    }
}