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It's a way to promote php for other type of applications. Check swoole and reactphp, they will be benefiting the most.

Also check for memory leaks while you are at it.

It isn't limited to a single request, it's merely pointing out that typical web request handling has more limited potential for performance gains from it.

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.

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).