App\Kernel.php

<?php

declare(strict_types=1);

namespace App;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
use Symfony\Component\Routing\Matcher\UrlMatcher;
use Symfony\Component\Routing\RequestContext;

final class Kernel extends Routes implements HttpKernelInterface
{
    public function handle(Request $request, int $type = HttpKernelInterface::MASTER_REQUEST, bool $catch = true) : Response
    {
        $context = new RequestContext();
        $context->fromRequest($request);

        $matcher = new UrlMatcher($this->routes, $context);

        try {
            $attributes = $matcher->match($request->getPathInfo());
            $controller = $attributes['controller'];
            $response = new Response();
            $response = $controller($request, $response);
        } catch (ResourceNotFoundException $e) {
            $response = new Response('Not found!', Response::HTTP_NOT_FOUND);
        }

        return $response;
    }
}

App\Routes.php

<?php

declare(strict_types=1);

namespace App;

use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;

class Routes
{
    protected RouteCollection $routes;

    public function __construct()
    {
        $this->routes = new RouteCollection();
    }

    public function getRouteCollection() : RouteCollection
    {
        return $this->routes;
    }

    public function route(string $path, callable $controller) : void
    {
        $this->routes->add($path, new Route($path, [
            'controller' => $controller,
        ]));
    }

    public function with(string $path, callable $routes) : void
    {
        $subRoutes = new Routes();
        $routes($subRoutes);

        $subCollection = $subRoutes->getRouteCollection();
        $subCollection->addNamePrefix($path);
        $subCollection->addPrefix($path);

        $this->routes->addCollection($subCollection);
    }
}

index.php

<?php

declare(strict_types=1);

include('vendor/autoload.php');

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;


$app = new App\Kernel();

$app->route('/', function (Request $request, Response $response) : Response {
    $response->setContent('Root');

    return $response;
});

$app->with('/news', function (App\Routes $app) {
    $app->route('/', function (Request $request, Response $response) : Response {
        $response->setContent('News root');

        return $response;
    });

    $app->route('/{year<[0-9]{4}>}', function (Request $request, Response $response) : Response {
        $response->setContent('News from ' . $request->getRequestUri());

        return $response;
    });
});

$request = Request::createFromGlobals();
$response = $app->handle($request);
$response->send();