[bouncycastle]

Well, most of php is just calling C functions. So if they add a JIT to that, it could be a believable claim. Why not?

[jashmatthews]

No implementation of a language as dynamic as something like PHP has ever managed it in practice. TruffleRuby uses Java for particularly performance sensitive parts. JSC relies on calling C++ or "intrinsics" which are hand-written IR snippets of code to JIT.