How to access user data?

Question

Bitrix24

Bitrix 24 corporate portal. Created a simple PHP component that displays text on a page.
How can I now restrict the display of this text (code) only to registered users?
How to access user data?
It is clear that everything is stored in the database, but is there any method, superglobal array, etc.?
Type

if ($logged==true) { echo 'Текст для зарегистрированных пользователей';}
if ($username=='Иван') { echo 'Привет Иван';}

Answer 1

\Bitrix\Main\Engine\CurrentUser