xyzshop/mobile/signature.php

<?php

Log::record("This is signatrue file.");

$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];
$echostr = $_GET["echostr"];

echo("{$echostr}");

$token = 'stanleykinghelloworld';
$tmpArr = [$token, $timestamp, $nonce];
sort($tmpArr, SORT_STRING);
$tmpStr = implode( $tmpArr );
$tmpStr = sha1( $tmpStr );

if( $tmpStr == $signature ){
    return true;
}else{
    return false;
}