Why array_shift() re-indexes arrays?
Why 2 simple string comparisons are slower than one preg_match()?
Why microtime(TRUE) returns only fraction of real time that is smaller than 1?
Why microtime() does not return float in the first place?
Why user-defined session-handling functions receive serialized session data that is already serialized?
Why parser reads multi-line comment slower than it reads heredoc or single-quoted string?
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