PHP speedups

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Structured overview on the things to keep in mind while writing your code. I think this topic and the length of the talk on this is very dependent on the audience. Personally I think most of the stuff should be basic knowledge of any programmer. It would've been nice to have some more info about the Big-Oh notation and algorithm complexity. I have the feeling PHP developers care less about that than, for example, Java developers.

Big win for me was that I finally got profiling and debugging working in my IDE in the practical part.