Informative article. I think most people will get confused based on the fact I get asked this question a lot. Especially on functions that are capable of returning a zero even though that is a positive return, such as the aforementioned strpos. It's something people should be consciously aware of when coding their scripts as otherwise it's just blind conformity.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.