What are good tools/frameworks for i18n of a php codebase?

Question

I have been looking at a few options for enabling localization and internationalization of a dynamic php application. There appears to be a variety of tools available such a

Answer 1

Xataface can be used to quite easily internationalize an arbitrary PHP/MySQL application. It support translation of both your static text, and your database data. All you have to do is add a line or 2 of code to a couple of places in your application and it's good to go.

http://xataface.com/documentation/tutorial/internationalization-with-dataface-0.6