How to show in a certain place only for an authorized user?

<?php if(function_exists('atr_show_attribute')) { echo atr_show_attribute(17); } ?>

I paste this code but it shows also not authorized user.

I have such settings for this attribute on the screen.

osc_is_web_user_logged_in() returns true if user is logged.

Thank you very much! I made this code and it works
Only for authorized users

<?php if(osc_is_web_user_logged_in()) { echo atr_show_attribute(20); } ?>

How to make only the author of the ad see it?

So that the agent can add additional data contacts and addresses of objects

osc_logged_user_id() == osc_item_user_id()

Thanks a lot! The script works