PHP isn't exactly designed for this kind of thing. An MSN client would require a constant connection to the server, and a PHP script is intended to be executed quickly, and then terminate and send all output to the client via the webserver. Although I guess it would theoretically be possible to create an MSN client in PHP (
if you knew the protocol it uses, which I don't), it would probably be one of the worst languages you could do it in, and would be absolutely terrible running on a standard webserver. A better way, I think, would be to create a standalone program that acts as an MSN API and allows PHP to interface with it.
Oh, and I'm assuming you mean an MSN client that actually operates on the network allowing standard Messenger-like interaction with other users using the standard client, not just a simple chat script or something
like MSN.
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