Middleware

<?php

function  authMiddleware($get) {
    if (!isset($get['key']) || $get['key'] != 'secret') {
        return 'Unauthorized';
    }
    return handleRequest($get);
}

function handleRequest($get) {
    return '<h1>My home page</h1>';
}


$res = authMiddleware(handleRequest($_GET));
echo $res;