// index.php
require __DIR__ . '/init.php';
// init.php
require __DIR__ . '/db/helper.php';
require __DIR__ . '/other/helper.php';// index.php
define('APP_ROOT', __DIR__ . '/app');
require APP_ROOT . '/db.php';.
// app/db.php
require APP_ROOT . '/some/helper.php';include('header.php');
include('main.php');
include('footer.php');