This site is dedicated to supporting PHP on Microsoft Windows. It also supports ports of PHP extensions or features as well as providing special builds for the various Windows architectures.
If you like to build your own PHP binaries, instructions can be found on the Wiki.
If you are using PHP as FastCGI with IIS you should use the Non-Thread Safe (NTS) versions of PHP.
If you are using PHP with Apache 1 or Apache2 from apache.org (not recommended) you need to use the older VC6 versions of PHP compiled with the legacy Visual Studio 6 compiler. Do NOT use VC9+ versions of PHP with the apache.org binaries.
With Apache you have to use the Thread Safe (TS) versions of PHP.
More recent versions of PHP are built with VC9 or VC11 (Visual Studio 2008 and 2012 compiler respectively) and include improvements in performance and stability.
The VC11 builds require to have the Visual C++ Redistributable for Visual Studio 2012 x86 or x64 installed.
TS refers to multithread capable builds. NTS refers to single thread only builds. Use case for TS binaries involves interaction with a multithreaded SAPI and PHP loaded as a module into a web server. For NTS binaries the widespread use case is interaction with a web server through the FastCGI protocol, utilizing no multithreading (but also for example CLI).
Profile Guided Optimization is an optimization feature available in Microsoft's Visual C++ compiler that allows you to optimize an output file based on profiling data collected during test runs of the application or module.
The x64 builds of PHP for Windows should be considered experimental, and do not yet provide 64-bit integer or large file support. Please see this post for work ongoing to improve these builds.
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