Options +FollowSymLinks
RewriteEngine On
RewriteBase /define/the/path/to/access/this/app/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]

<?php
define('BASEPATH', '/define/the/path/to/access/this/app');

require_once ROUTES_DIR . '/index.php';

function home($sub=null) {
    print "you are in home `$sub`";
}

class FooController extends Controller {
    public function __invoke($sub=null) {
        print "you are in FooController `$sub`";
    }
}

class BarController extends Controller {
    public function GET() {
        print "you are in BarController, baby";
    }
}

$main = new App(BASEPATH);
$main->attach(new Route('/', 'home', 'GET'));
$main->attach(new Route('/foo', new FooController, array('GET', 'POST')));
$main->attach(new Route('/bar', new BarController));

$sub = $main->attach(new Router('/{sub}'));
$sub->attach(new Route('/', 'home', 'GET'));
$sub->attach(new Route('/foo', new FooController, 'GET'));
$sub->attach(new Route('/bar', new BarController));

$main->run();