007 — Exceptions

• Throw exceptions instead of returning an error code.
• Exception class name must be suffixed with Exception.
• Use grammatically correct error messages including ending punctuation, that's most exceptions must end with a period.
• \InvalidArgumentException must be used directly. There should be no exceptions inherited from it.
• \InvalidArgumentException must never be caught.

Referencias

• International community discussion and poll
• Russian community discussion and poll