Via PHP Everywhere, DevShed: Socket Programming with PHP. "One of PHP's better-guarded secrets - and one that I discovered quite by accident - is a very comprehensive set of network programming functions. Steadily evolving over the last few releases, this socket programming API now supports almost everything you would need for socket-based client-server communication over TCP/IP, and can be rapidly deployed to build simple client-server applications in PHP."
No way I have time to read it now, but it looks informative.
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