It is generally easier to use the Zip file installation. Alternately, all of the extensions can be installed this results in an unstable system because some of the extensions can conflict with others. By default, no extensions are installed, and this can adversely affect the usefulness of the PHP installation. The Windows Installer version can get a complete PHP environment up and running, but the installation of extensions can be confusing.

Either method will get PHP working, but both have some extra steps that are needed to make PHP work well. There are two main ways to install PHP on a Windows®-based computer: download the Windows Installer or use the Windows Zip file from the PHP Web site. As a result, there is a performance improvement on IIS when using the NTS version when compared to the tread-safe version because the NTS version avoids unnecessary thread-safety checks (FastCGI ensures a single-threaded execution environment). The NTS version does not have any of the code that allows PHP to manage multiple threads. The architecture of IIS and the FastCGI extension provide an isolation model that keeps requests separate, removing the need for a thread-safe version.

The thread-safe version is designed for environments where the Web server core can keep the PHP engine in memory, running multiple treads of execution for different Web requests simultaneously. There are two builds for each PHP version: one is thread-safe, and one is not (referred to as the non-thread-safe version). Alternately, use the instructions that follow as guidance for installing PHP with Windows® Installer or using a compressed (Zip) file installation.

With Web PI, you can navigate to the 'Web Platform' tab and select 'PHP' under 'Framework and Runtimes' customize link. Web PI completely automates setting up IIS, FastCGI, and the latest version of PHP from the php.net Web site. The fastest and easiest way to install PHP on Internet Information Services (IIS) is by using the Microsoft® Web Platform Installer (Web PI).

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