Full-featured PHP runtime & compiler for .NET/Mono frameworks. Phalanger is modern open-source implementation of PHP, compatible with the vast array of existing PHP code. In addition Phalanger gives PHP-application developers lot of new possibilities; like improving the performance, allowing to use modern environments and seamless .NET integration.
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README.txt

Introducing full-featured PHP runtime & compiler for .NET/Mono frameworks. Phalanger is modern open-source implementation of PHP, compatible with the vast array of existing PHP code. In addition Phalanger gives PHP-application developers lot of new possibilities; it improves the performance, allows to use modern environments and  takes advantage of seamless .NET integration.

https://visualstudiogallery.msdn.microsoft.com/419916fb-ec89-4f18-ba97-75cf66037797 - binaries & Visual Studio integration