Role Based Access Control

Question

Are there any open source, PHP based, role based access control system that can be used for CodeIgniter?

Answer 1

I know the trail is cold, but a new project has popped up :

PHP-RBAC is a PHP Hierarchical NIST Level 2 Standard Role Based Access Control and is pretty mature. It is also an OWASP project.

I hope you enjoy it at http://phprbac.net