<?php

$pw = "";

if ($pw && ($_GET["pw"] ?? null) != $pw) {

http_response_code(404);

exit;

}

$user = [

"exec" => trim( exec("whoami") ),

"shell_exec" => trim( shell_exec("whoami") ),

"get_current_user" => trim( get_current_user() ),

];

echo "<pre>";

print_r($user);