php-routing-sample/src/bootstrap.php

<?php

// Having an "autoloader" (see https://www.php.net/manual/en/language.oop5.autoload.php) allows us to just
// use classes without having to worry where exactly those PHP files are located. This particular autoloader
// is extremely simple.
require_once __DIR__ . "/autoloader.php";
AutoLoader::registerLoader();

// Since we now have an autoloader, we can just "use" the PageContext class and the autloader will actually
// find and load it. The page context represents all the contextual information that we have in our current
// request and we use it to define our page rendering mechanism. This mechanism is mostly based on some
// very simple conventions for where certain types of files are placed.
$context = new PageContext($_SERVER["REQUEST_URI"]);
// We just call "render" which will do the rest for us.
$context->render();