WE FEAR CHANGE

fibre_noddy_1.php

<?php

declare(strict_types = 1);

class Scheduler implements FiberScheduler
{
    private string $nextId = 'a';
    private array $callbacks = [];

    public function run(): void
    {
        while ($this->isQueueEmpty() !== true) {
            foreach ($this->callbacks as $id => $callback) {
                unset($this->callbacks[$id]);
                $callback();
            }
        }
    }

    private function isQueueEmpty(): bool
    {
        return count($this->callbacks) === 0;
    }

    public function queue(callable $callback): void
    {
        $this->callbacks[$this->nextId++] = $callback;
    }
}

$scheduler = new Scheduler;


// Okay, so this is receiving a fiber...so it's going to be called from within
// the fiber, right?
$give_this_a_name = function (Fiber $fiber) use ($scheduler) {

    // why does this need to be wrapped?
    $give_this_a_name_also = function () use ($fiber) {
        // Why does this need to resume a fiber?
        return $fiber->resume("Test");
    };
    $scheduler->queue($give_this_a_name_also);
};

// "Pause main fiber, which will be resumed by the scheduler."
// I don't understand this comment....or the name of the method.
// shouldn't it be something more 'active' like 'dispatch' or 'switchTo'? 
$value = \Fiber::suspend($give_this_a_name, $scheduler);