The following instructions will help you install a PHP module for the Apache web server included in MacOS X using the MacOS GUI. This version includes MySQL, PostgreSQL, and iODBC database support, cURL, GD, PDFLib, LDAP, and more. These instructions are graciously provided by » Marc Liyanage.
Be sure you know what you're doing before advancing beyond this point! You can cause irreparable harm to your Apache installation otherwise.
These instructions will only work with the original Apache web server as shipped by Apple. If you re-built or upgraded your Apache, you will have to build your own PHP module.
That's all! PHP should now be up and running. You can test it by dropping a file named test.php into your Sites folder in your home directory. Into that file, write this line: <?php phpinfo() ?>.
Now open up 127.0.0.1/~your_username/test.php in your web browser. You should see a status table with information about the PHP module.