phpSecureSite is an authentication and session-handling system for Web applications built using PHP. It is designed to be very secure and easy to deploy. It gives newbie Web developers an easy way to add session-handling and authentication to their sites, and provides experienced developers with a trustworthy, functional, and flexible security system.
This sounds like a great way to add some security and sessions to a php-based app/website without having to do all the work yourself.