Async operating in PHP

Hey. For a long time now, I have been using nodejs and its async methods. I am even working on bridging nodejs and PHP via a native addon…but thats more complex for another thread. But, as I used nodejs, I enjoyed of being able to just push a callback into the event loop, so I could continue my code, while a heavier operation is sent to the background. Will PHP ever have this? That would certainly be very interesting to have, the option to just push away a bigger task. Kind regards, Ingwie.