Which is best for ACL?

[eluser]esra[/eluser]
The phpGACL library by Mike Benoit is a another solution but it is dependent on the ADODB database abstraction layer. Earlier someone was attempting to port this over to CI by adapting the ADODB calls to CI database calls. CI syntax and ADODB syntax are similar. phpGACL uses nested sets, so understanding their code requires some knowledge of the nested sets model. phpGACL supports AXO objects which should allow you to support just about any kind of authorization, including access to various kinds of content.

There is a RBAC solution with code posted on the web at sqlrecipes.com that appears to be extremely versatile. I started to port this over some time ago, but the project fell to the wayside because of other priorities. Aside from supporting role and permissions objects, this project also supports domain objects which are somewhat compatible to phpGACL AXO objects (in a RBAC way of thinking).

Rick's solution also looks interesting. You might note that Zend also had a proposed phpGACL solution sitting in hibernation for a while and it was abandoned because of Zend ACL. However, you might be able to find some information there about it hidden in the bowels of the Zend wiki or in mailing list threads.