Install PHP with Microsoft Web Platform Installer 2.0
While the task of setting up PHP on IIS was not a difficult one, it anyway required a lot of manual installation and configuration steps. With the PHP 5.2.9-1 release the PHP development community has put a lot of improvements to the PHP installer to make it easy to setup PHP on IIS 5.1, IIS 6.0 and IIS 7.0. The latest PHP installer can be downloaded from the PHP community site.