How to get variable from route in lumen(laravel)?

Question

Laravel

I made this route in laravel:

Route::get('/{category}', '[email protected]');

And then in the controller

public function categories(Request $request){
        dd($request->all());
    }

Everything worked fine and the $category variable was displayed.
But not so in lumens. Route similarly:

$app->get('/{category}', '[email protected]');

And the same controller outputs emptiness. Any attempt to find this variable is futile. However, if you just dd($request) and search the page, such a key=>value exists.
How to be?

Answer 1

public function categories($category){
        dd($category);
    }