Which is best for ACL?

[eluser]Kemik[/eluser]
The ability to assign users to multiple groups is interesting, and common sense. I'm not sure why I didn't think of that.

I'm not sure, because it's a whole other framework and because permission checks on are on every page, it would be viable to implement Zend Framework to my application. If it is possible with minimal overhead then please let me know, because I'd hate to have to code it myself and have wasted time.