How to display the username by its ID?

Question

1C-Bitrix

Hello!
I have not come across such a task for a long time, and I completely forgot, tell me - how to display the username by its ID?
There is no need to use the main user link, but there is already a user ID, you need to display the name.
Thanks

Answer 1

$rsUser = CUser::GetByID($ID);
$arUser = $rsUser->Fetch();

CUser class