Java, C++, COBOL :(, and started teaching myself PHP to work on this site before I decided it would be in my best interest to implement it and learn with a framework instead.
I love CodeIgniter but it seems development for it is quite slow (I don't know about now) which is the reason why I decided to fork it in the first place. Still I find the code quite elegant except for it's hackish workaround found in the core engine.