Purely functional event loop in php because why not?

main.php

<?php
$loop = PureLoop::loop();
 
$ticked = $loop->flatMap(function(PureLoop $loop) {
    return $loop->nextTick(function(PureLoop $loop) {
        return StdIO::putStrLn("Hello from tick")->then(IO::of($loop));
    });
});
 
$timed = $ticked->flatMap(function(PureLoop $loop) {
    return $loop->addTimer(new AsyncTimer(2, function(PureLoop $loop) {
        return new More(StdIO::putStrLn("Hello from timer")->then(IO::of($loop)));
    }));
});
 
$ran = $timed->flatMap(function(PureLoop $loop) {
    return $loop->runLoop();
});
 
$ran->unsafePerform();