warehouse/app/Http/Controllers/Items/ShowCreateItemFormController.php

<?php

namespace App\Http\Controllers\Items;

use Framework\Routing\Router;

class ShowCreateItemFormController
{
    public function handle(Router $router)
    {
        if (!session()->has('user_id')) {
            return redirect($router->route('show-register-form'));
        }

        return view('items/create', [
            'createAction' => $router->route('create-item'),
            'csrf' => csrf(),
        ]);
    }
}