Can I create threads in PHP?

Possible duplicate:
Does PHP have streaming?

I found this: http://php.net/manual/en/function.pcntl-fork.php

But I can’t say if these flows or processes are confused. They use both words.

If you have an alternative solution, you need threads for this: I want to create a game in real time using web sockets, and I thought that in the background there is one process that generates one thread for each game (or room ) on request.