php微信关注后消息回复以及关键字回复

<?php
header('content-type:text/html;charset=utf-8');
define("TOKEN", "weixin"); //define your token
$wx = new wechatCallbackapiTest();
if($_GET['echostr']){
    $wx->valid(); //如果发来了echostr则进行验证
}else{
    $wx->responseMsg(); //如果没有echostr，则返回消息
}
    
 
class wechatCallbackapiTest{
 
    //微信验证
    public function valid(){ //valid signature , option

        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){ //调用验证字段
            echo $echoStr;
            exit;
        }
    }
 
    /*
     返回消息数据
    */
    public function responseMsg(){

        $postStr = file_get_contents('php://input');//php7.0以上用这个接收参数、
        //数据
        // "<xml>
        // <ToUserName><![CDATA[gh_bb86c5992fd8]]><\/ToUserName>\n
        // <FromUserName><![CDATA[ojTmjwa0o63WAjWfbbkOUU-lr1IA]]><\/FromUserName>\n
        // <CreateTime>1550115489<\/CreateTime>\n
        // <MsgType><![CDATA[event]]><\/MsgType>\n
        // <Event><![CDATA[subscribe]]><\/Event>\n
        // <EventKey><![CDATA[]]><\/EventKey>\n
        // <\/xml>"
        //get post data, May be due to the different environments
        // $postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信发来的XML数据   版本php7.0以上这个函数已经作废
        file_put_contents('02.txt',json_encode($postStr));
        //extract post data
        if(!empty($postStr)){
         
            //解析post来的XML为一个对象$postObj
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);

            $fromUsername = $postObj->FromUserName; //请求消息的用户
            $toUsername = $postObj->ToUserName; //"我"的公众号id
            $keyword = trim($postObj->Content); //消息内容
            $time = time(); //时间戳
            $msgtype = 'text'; //消息类型：文本
            $textTpl = "<xml>
            <ToUserName><![CDATA[%s]]></ToUserName>
            <FromUserName><![CDATA[%s]]></FromUserName>
            <CreateTime>%s</CreateTime>
            <MsgType><![CDATA[%s]]></MsgType>
            <Content><![CDATA[%s]]></Content>
            </xml>";
            file_put_contents('01.txt',json_encode($postObj));


            if(strtolower($postObj->MsgType == 'event' )){ //如果XML信息里消息类型为event
                if($postObj->Event == 'subscribe'){ //如果是订阅事件
                    // $contentStr = $fromUsername."欢迎订阅misaka去年夏天32434！\n更多精彩内容：http://blog.csdn.net/misakaqunianxiatian";
                    // $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);
                    // echo $resultStr;
                    $contentStrq = "欢迎订阅：请点击链接<a href='http://blog.csdn.net/misakaqunianxiatian'>wordwrap</a>";
                    $resultStrq = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStrq);
                    echo $resultStrq;
                    exit();
                }
            }

            switch (keyword) {
                case '1':
                    $contentStr = '我是1号';
                    break;
                case '2':
                    $contentStr = '我是2号';
                    break;
                default:
                    $contentStr = '输入数字试试';
                    break;
            }
            $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);
            echo $resultStr;
            file_put_contents('01.txt',json_encode($resultStr));
            exit(); 

        }else {
            echo "";
            exit;
        }
    }
  
    //验证字段
    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;
        }
    }
}