If you're one of those people who loves compiling PHP from source code to run it locally on your Mac (because you don't use MAMP or other solutions like it), go grab the source code from PHP.net and get compiling! There are some nifty new features and modules in this release (Enchant module for spell checking, PHP Archive (phar) support, internationalization module - just to name 3 of the modules), along with such programming niceties as lambda functions, closures, and late static binding.