We use Code Igniter on all of our sites you see in my profile. Love it, love it. Has its issues, but I can't really put into words how useful it has turned out

We use Code Igniter on all of our sites you see in my profile. Love it, love it. Has its issues, but I can't really put into words how useful it has turned out to be for our team. We may very well go with Django long-term, but I've never spent a day regretting that we're using CI. And this from a guy who has always had a fairly low hacker opinion of PHP. CI kinda changed that a good bit once I pushed back my skepticism. I highly recommend it for PHP developers who want to move to the MVC model and get a lot of ROI on their development time. If you're comfortable with Ruby or Python, you'll enjoy the other frameworks more, of course. But I wouldn't use PHP on its own without Code Igniter.