How can I hide the IP of registered commentators?

Question

There is already a related question at How do I turn off wordpress comments ability to capture a users ip address?

But is there a solution to do it for users/mods/admins only?

So that normal anonymous visitors will have their IPs stored but registered users not.

Answer 1

Just add a check for the log in status:

add_filter( 'pre_comment_user_ip', 'wpse_53935_no_ip_for_logged_users');

function wpse_53935_no_ip_for_logged_users( $ip )
{
    return is_user_logged_in() ? 0 : $ip;
}