the same configuration was submitted for the first time, and the configuration was submitted successfully

when you modify the configuration for the second time, you will be prompted that token verification failed

<?php 
    //1.timestamp once token
    $timestamp=$_GET["timestamp"];
    $once=$_GET["once"];
    $token="yoga";
    $signature=$_GET["signature"];

    $array=array($timestamp,$once,$token);
    //sort($array);
    //
    $tmpstr=implode("",$array);
    $tmpstr=sha1($tmpstr);
    //signature
    if($tmpstr==$signature){
        echo $_GET["echostr"];
        exit();
    }

Note: it is Aliyun ip that was successfully submitted without sort sorting before. It is a useless domain name and does not need to be put on record

ask the master for advice