Appendix

The chapters before this were meant to be read. This part is meant for looking things up. Nobody memorizes the full list of PHP’s reserved keywords, and nobody should have to: that’s what an appendix is for.

Eight sections follow. A lists the reserved keywords you can’t use as identifiers. B is a reference table of operators and symbols. C recaps the SPL interfaces and magic methods scattered through earlier chapters, gathered in one place. D is a tour of the tools worth installing once you’re past the basics. E covers version support and backward compatibility. F and G are shorter still: translation status, and a look at how PHP itself gets decided. H links every feature this book covers to its entry in the online PHP Dictionary.

Skim it now if you like, but you’ll get more out of it the next time you’re mid-project and can’t remember whether it’s ??= or ?=.