WeChat official account interface configuration information failed

Question

##<?php

define('TOKEN','peter');

$signature =$_GET['signature']; //Encrypted signature

$timestamp=$_GET['timestamp'];//Timestamp

$nonce=$_GET['nonce'] ;//Random number

$echostr=$_GET['echostr'];//Random string

//Sort the array

$arr=[$timestamp ,$nonce,TOKEN];

sort($arr,SORT_STRING);

$str=sha1(implode($arr));

//This request is From WeChat

if($signature==$str){

echo $echostr;

}

?>

Answer 1

Not all the code is written