Undocumented Socket functions?

Can anyone here decipher for me some of the undocumented Socket functions in PHP4? For instance, how do I use select() to multiplex multiple connections? With the functions that are documented, there is a nice example of a simple echoing TCP server, but it only accepts a single connection which has limited usage. Can anyone come up with an example to expand that to multiple connections. The suggestions in the manual to read man pages & C tutorials has helped me wrap my head around the multiplexing loop concept, but I still can't decipher how to actually create this using the functions available (mostly because I don't program in C).

                    Visit the Gates Motel webgame:
                    http://www.gameslate.com/gatesmotel/