How to combine $request->all() with additional fields?

Question

Laravel

There are additional fields

$product['slug'] = $slug;
              $product['user_id'] = Auth::id();

There is an extensive list of data from the request
$request->all();
In style Needs to be combined so that later
$request->input('name');
$product->create($product);

Answer 1

$request['some_value'] = $some_value;

Answer 2

array_merge?