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I am guessing blog author has got some things wrong here. I would expect JIT will be useful in a fastcgi setup.

Edit: to clarify, PHP processes in fastcgi persist across multiple web requests. So seems reasonable to me that a JIT would do useful work here. The JIT could even run while the PHP process in a fastcgi pool is idle waiting for next job.

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In Facebook's HHVM, PHP has had a JITed interpreter for well over 5 years that people have used in production for great gains. However, most people have moved back to reference PHP 7+ and I believe HHVM had even stopped supporting PHP (it's main use was as an interpreter for & three closely related Hack language).

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