Working with PHP 5 in Mac OS X 10.5 (Leopard)

Mac OS X is a great development platform for working with PHP. Leopard comes with Apache, PHP and many other development tools, such as subversion already installed. Leopard brings a much needed upgrade from Tiger's tired PHP 4 to a very modern version of PHP 5.2.4. This is a guide for setting up a PHP development environment under 10.5 using the version of PHP that ships with leopard.