laravel get value from array of controllers

this is my PermissionController.php

foreach (Route::getRoutes() as $route)
{
    $action = $route->getAction();

    if (array_key_exists('controller', $action))
    {
       $controllers[] = $action['controller'];
    }
}
return view('permission.create')->withControllers($controllers);

and my permission/create/php is like this :

{!! Form::select('class_name[]', $controllers, null, ['class' => 'form-control', 'multiple']) !!}

here in controller, it put the name of all controllers in $controller and send it to the blade but when i select some of them, the request gives me their keys instead of value

public function store(Request $request)
{
    return $request->get('class_name');
}

if I select the first one and third one the output is for example :{"1","3"} but I want their value like this : {"UserController.php", "TestController.php"}

via Chebli Mohamed