I'm not affiliated with the Snoopy project at all, I just stumbled across it the other day. It's small and easy to use.
Here is a description of the library taken from their site,
http://sourceforge.net/projects/snoopy:
Quote:
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Snoopy is a PHP class that simulates a web browser. It automates the task of retrieving web page content and posting forms
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It's 1 file to include and you can use it in 2 lines of code.
I hope someone finds this useful.