How to communicate between iOS app and php?

What is a simple way to send a few obj-c variables to a开发者_JAVA百科 php script, and return data. (Sample code please :))

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Try to use property list encoding: http://developer.apple.com/library/mac/#documentation/cocoa/conceptual/PropertyLists/Introduction/Introduction.html

Built-in in Objective-C, and very easy to use from PHP, as it's only XML...