I can't speak for other frameworks, but I definitely second on Kohana, it's light and gets out of your way when you need, yet affords a lot of the newer best pr

I can't speak for other frameworks, but I definitely second on Kohana, it's light and gets out of your way when you need, yet affords a lot of the newer best practices. If anything, documentation for v3 is lacking, but the forums are somewhat active and the php code isn't actually that complex. Application structure and the idea of overlays on top of system files is an interesting concept and pretty useful.