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Re:Rambling On [PHP] Internals by eksith on Friday September 06, 2013 @05:02PM (#6342661)
That's extremely helpful advice.

The video to those slides : https://www.youtube.com/watch?v=ZSFDm3UYkeE

Re:Rambling On [PHP] Internals by DavidHogue on Friday September 06, 2013 @07:22PM (#6343202)
They also have a few other talks on youtube about similar topics and a book now: http://shop.oreilly.com/product/0636920018025.do