[oinksoft]

I'm not sure what you're getting at. Is there reason to believe that this will not work with PHP >= 5.3?

[Mikushi]

It will be is not structured using Namespaces, which can be annoying if you are using them on a day to day basis and want to integrate something like Yaf that doesn't use them.

[underwater]

You could always write your own namespaced shim classes if it matters that much to you.