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InfluxDB
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thats absolutely not true. Lookup swoole && roadrunner: https://openswoole.com/
Providing a built-in event loop is certainly affordable, Fibers in PHP 8.1 are just one building block, and hopefully in the near feature ( PHP 9? ) we will have an event loop built on top of libuv, the cost for async in PHP is time for the implementation, and certain details, see ext-uv by Amphp team ( also authors of Amphp async framework, and Fiber RFC ): https://github.com/amphp/ext-uv
I know I could check this myself with some code and tests - but perhaps someone here knows the answer already: Can/will PHP's JIT.compiler optimize tail-calls? I am aware of trampoline to avoid blowing the stack in deep recursions now - but it would of course be a pretty neat to have built-in optimization.