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Don't know if it's vanilla, but there seems to be some: https://medium.com/@aarthimanikandan2006/does-facebook-still-use-php-unveiling-the-technology-behind-th

• phyrex 2y ago
  That’s just some guy that asserts stuff though. I mean, so am I to you, but fwiw I’ve never seen or heard of any non-hack PHP in the current codebase