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Re:Ask HN: State of PHP at Facebook? by connordoner on Wednesday October 27, 2021 @01:29PM (#29016321)
There is: it's called XHP (https://docs.hhvm.com/hack/XHP/introduction).

That said, I'm not sure how you'd go about server-side rendering React from Hacklang, as it seems that the open-source solution to do so is no longer supported (https://github.com/hhvm/xhp-js).

Re:Ask HN: State of PHP at Facebook? by fredemmott on Thursday October 28, 2021 @11:35AM (#29027317)
To clarify, xhp-js was not server-side rendering - it's a framework for generating javascript code, and getting an DOM element ID for a react element that the hack code can refer to and use elsewhere, e.g. by passing to some other generated JS.