I think we have a vastly differing definition of "in production". I'll agree PHP was good enough for plenty of things, and likely still is. But good enough in general to run things in production as it's understood today? You'll find that many people will disagree with you here, not just me.
> Later versions have introduced a JIT and support for concurrency concepts such as fibres, as in the upcoming PHP 8.1 https://php.watch/versions/8.1/fibers.
That's what I mean, not only for PHP but for like 99% of all programming languages: they play catch-up, waaaaaaaaay too slowly and gradually, with things that should be baseline by now. Happily Erlang/Elixir are having lightweight and transparent parallelism and concurrency for a long time now. Languages like Go and Rust also progressed very well in this area so I am looking to work more with them in the future as well.
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I think you and I are not aligned on what is "successful" or "good enough". You seem to insist that statistical success speaks something of the merits of a technology, and this is where I and many others disagree: people just adapt to what's given to them. That doesn't say almost anything about if the thing is good or not. People simply get what they can. Back then PHP was available so they took that. The rest is post-hoc rationalization. Stretching the simple and isolated historical fact "people used PHP because there was nothing else viable at the time" to mean that "PHP is good and successful" is where I'll disagree with you.
But yep, we severely digressed from the original discussion. I am OK with that though.