Multiple PHP versions on the same IIS server

This post describes how to configure IIS to support multiple versions of PHP on the same server. This kind of setup is useful in development environments where it is necessary to test an application with different PHP versions. Also, it is often used in production environments, where many PHP applications are hosted on the same server and some of them have dependency on a particular PHP version.

In order to setup multiple versions of PHP side by side on the same IIS server it is necessary to install PHP manually by following the steps described in documentation for IIS 5.1 and IIS 6.0 and for IIS 7.0 and later. Do not use PHP Windows installer because it does not support side by side installations.

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