classes inside classes

hi, i have worked with ASP on windows IIS for a long time now, but have started to use PHP more and more. there is a feature in ASP that i can't seem to replicate in PHP. i have a class called Net. in this class i would like to have an other class called FTP. and in the class FTP, have a method called Get(). so then i could access Net::FTP::Get() for example. does this exist in PHP or is there a workaround? Thanks for your time and your help Tim.