Laravel框架之微信机器人,关键字回复

我们每个人都在使用微信,那订阅号,公众号中的机器人以及关键字是如何实现的呢?

<?php
namespace App\Http\Controllers\Api;
use App\Http\Controllers\Controller;
use function Couchbase\defaultDecoder;

class ApiController extends Controller{
    /*此处开始为机器人以及关键字回复*/
    public function robot(){
        define("TOKEN", "mengxianglei");
        $wechatObj = new ApiController();
        if(!isset($_GET['echostr'])){
            $wechatObj->responseMsg();
        }else{
            $wechatObj->valid();
        }
    }
	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
		$postStr = file_get_contents("php://input");
//		var_dump($postStr);die;
      	//extract post data
		if (!empty($postStr)){
              	$postObj = simplexml_load_string($postStr, 'SimpleXMLEle