Private categories work in conjunction with user-groups. You can create a user-group and assign some private categories to that group. Now, all users (KB Members) of that group would be able to view those private categories after login on the front-end. Please have a look at the screencast below to see how private categories and user-groups work in PHPKB software.
This video would explain to you how you can associate private categories with user-groups for group-based access to the private content in your knowledge base.
Article ID: 29
Created: November 23, 2011
Last Updated: November 23, 2011
Author: Ajay Chadha [support@phpkb.com]
Online URL: https://www.phpkb.com/kb/article/how-do-i-get-the-private-categories-to-display-29.html