I saw a link on twitter referring to PHP optimization advice from Google. There are a bunch of advices there, some of them are quite sound, if not new – like use latest versions if possible, profile your code, cache whatever can be cached, etc. Some are of doubtful value – like the output buffering one, which could be useful in some situations but do nothing or be worse in others, and if you’re a beginner generally it’s better for you to leave it alone until you’ve solved the real performance problems.
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