Calling other PHP functions from your extension

Hello, I've been messing around with my own PHP extension for a couple of days now (I was pleasantly surprised to find how easy it was to write one!), one I've been meaning to write for over a year and I had a couple of questions I hope I can get some help on: i) is it possible to call other functions in PHP from your functions? In particular, I'd like to eval() a string I have and return the resultant string to the user -- is there anyway I can do this? ii) I'm making fast progress in my extension, and I think it might be something that might be worthy of inclusion into the main PHP distribution. What steps are involved in submitting a module for such consideration? Wood Shavings! Andrew Patterson