Namespace Hierarchy in PHP

Is there any issue or conflict about the hierarchy of using namespace? I mean if I have 5 imported class, should I have to arrange them? Or is it not necessary?

Is there anything to consider with the example below? Or is there any difference? How about in terms of best practices?

Example:

use App\User;

use App\UserProfile;

use App\Post;

use App\Comments;

VS

use App\Post;

use App\User;

use App\UserProfile;

use App\Comments;