Standards either proposed or approved by the Framework Interop Group - phpDocumentor/fig-standards

I'm often asked why the book Refactoring isn't included in my recommended developer reading list. Although I own the book, and I've read it twice, I felt it was too prescriptive – if you see (x), then you must do (y). Any programmer worth his or her salt should already be refactoring aggressively. It's so essential to the craft that if you have to read a book to understand how it works, you probably shouldn't be a programmer in the first place.