Apologies if you're unable to load this paper (I think it's paywalled), but it was published in 2023 in the Proceedings of the 29th Symposium on Operating Systems Principles, and it describes how Meta (Facebook) does serverless functions in their own infrastructure.

What's interesting is that the paper says, "Our PHP runtime is called HHVM." Twice, it uses the phrase "our PHP runtime."

In 2023.

The last version of HHVM to support PHP was released in 2018.

dl.acm.org/doi/10.1145/3600006…

#PHP #HHVM

XFaaS: Hyperscale and Low Cost Serverless Functions at Meta | Proceedings of the 29th Symposium on Operating Systems Principles

^{ACM Conferences}