//Create the router dispatcher
$dispatcher = FastRoute\simpleDispatcher(function (FastRoute\RouteCollector $r) {
    $r->addRoute('GET', '/hello/{name}', function ($request) {
        //The route parameters are stored as attributes
        $name = $request->getAttribute('name');

        //You can echo the output (it will be captured and written into the body)
        echo sprintf('Hello %s', $name);

        //Or return a string
        return sprintf('Hello %s', $name);

        //Or return a response
        return new Response();
    });
});

$dispatcher = new Dispatcher([
    new Middlewares\FastRoute($dispatcher),
    new Middlewares\RequestHandler()
]);

$response = $dispatcher->dispatch(new ServerRequest('/hello/world'));

$route = new Middlewares\FastRoute($dispatcher);

$responseFactory = new MyOwnResponseFactory();

$route = new Middlewares\FastRoute($dispatcher, $responseFactory);

$dispatcher = new Dispatcher([
    //Save the route handler in an attribute called "route"
    (new Middlewares\FastRoute($dispatcher))->attribute('route'),

    //Execute the route handler
    (new Middlewares\RequestHandler())->attribute('route')
]);