Нужна ли тут передача по ссылке?

$app = App::create(new Container(array_merge_recursive(...array_map(function ($file) {
    return [pathinfo($file, PATHINFO_FILENAME) => include $file];
}, glob(sprintf("%s%sconfig%s*.php", getcwd(), DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR))))));
 
ServiceProvider::setup($app, $app->getContainer()->get('providers'));
 
return $app;

abstract class ServiceProvider
{
    protected $app;
 
    public function __construct(App $app)
    {
        $this->app = $app;
    }
 
    public static function setup(App $app, $providers)
    {
        $providers = array_map(function ($provider) use ($app) {
            return new $provider($app);
        }, $providers);
 
        array_walk($providers, function (ServiceProvider $provider) {
            return $provider->register();
        });
 
        array_walk($providers, function (ServiceProvider $provider) {
            return $provider->boot();
        });
    }
 
    abstract protected function register();
 
    abstract protected function boot();
}