I think that in some cases it makes sense to convert a Fiber to a Generator (Coroutine) for convenience. In such cases, this code will be useful:
<?php
function fiber_to_coroutine(\Fiber $fiber): \Generator
{
$index = -1; // Note: Pre-increment is faster than post-increment.
$value = null;
// Allow an already running fiber.
if (!$fiber->isStarted()) {
$value = yield ++$index => $fiber->start();
}
// A Fiber without suspends should return the result immediately.
if (!$fiber->isTerminated()) {
while (true) {
$value = $fiber->resume($value);
// The last call to "resume()" moves the execution of the
// Fiber to the "return" stmt.
//
// So the "yield" is not needed. Skip this step and return
// the result.
if ($fiber->isTerminated()) {
break;
}
$value = yield ++$index => $value;
}
}
return $fiber->getReturn();
}
?>
