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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