PHP

input if not null laravel

public function store(Request $request)
{
    if($request->filled('user_id')) {
        dd('user_id is not empty.');
    } else {
        dd('user_id is empty.');
    }
}

input if not null laravel

public function store(Request $request)
{
    if($request->has('user_id')) {
        dd('user_id is exists.');
    } else {
        dd('user_id is not exists.');
    }
}