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Now that the verification has passed, the only thing left is to return it to WeChat. If I return echostr or true, WeChat says my token verification failed

<?php
namespace app\index\controller;

use think\Request,think\Db;
use think\Cache;
class Autoreply extends RestBase{
    // 獲取微信數(shù)據(jù)
    public function checktoken(){
        $request = Request::instance();
        $get = $request->param();
        $timestamp = $get['timestamp'];//timestamp其實(shí)就是一個(gè)時(shí)間戳  
        $nonce     = $get['nonce'];//nonce是一個(gè)隨機(jī)參數(shù)  
        $token     = "";//這個(gè)token填寫(xiě)你在微信公眾平臺(tái)上寫(xiě)的那個(gè)值  
        $signature = $get['signature'];//這個(gè)signature其實(shí)就是在微信公眾平臺(tái)已經(jīng)加密好的字符串  
        $echostr   = $get['echostr'];  
        $array = array();
        $array = array($token,$timestamp,$nonce);
        sort($array);
        $tmpstr = sha1(implode('',$array));  
        if($tmpstr == $signature){
            echo $get['echostr'];
        }else{
            return false;
        }
        
    }
}