Sam Pierson's Blog

As with OS X Leopard Server, the OS X Leopard standard OS is missing Apache config statements to enable PHP support. Of course with standard Leopard, you don’t get the fancy Server Admin tool to let us fix it via a GUI, so we do it by hand:
In /etc/apache2/httpd.conf:
Uncomment the php LoadModule statement:

LoadModule php5_module [...]

In OS X Leopard, out of the box (at least on the System I got access to) Apache2 is missing an AddHandler statement for PHP, so PHP won’t work if you just enable the module.  Here is how to fix that through Server Admin:
Check -> Web -> Settings -> Modules, php5_module is enabled.
In Settings -> [...]