oop wise, i think u can pretty much do anything c can do... well, cept for visuals, but i'm starting to wonder if even graphics are completely possible in php. (form windows, etc.) u can do anything u want with php. you just have to want to code it and get a nice project. i started using php 3 years ago and i'm 18 now. smartest thing i've ever done was get into it. file manipulation, ftp progz, web authoring tools, scientific calc, irc clients... you name it, it can be done.
theres my two cents 🙂