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http://www.blackhat.com/presentations/bh-usa-09/ESSER/BHUSA09-Esser-PostExploitationPHP-PAPER.pdf
http://www.blackhat.com/presentations/bh-usa-09/ESSER/BHUSA09-Esser-PostExploitationPHP-SLIDES.pdf
Thanks for the share mandi, nice to see you getting on well with web app sec :)