Hack/HHVM no longer has a goal to be PHP compatible, but it looks pretty much the same. It does have a JIT: https://hhvm.com/blog/2027/faster-and-cheaper-the-evolution-...
- https://phabricator.wikimedia.org/T176370
- https://phabricator.wikimedia.org/T229792
- https://launchdarkly.com/blog/how-the-wikimedia-foundation-s...