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<?php class Awaitable { private $callbacks = []; function when(callable $cb) { $this->callbacks[] = $cb; } function resolve($error, $value) { if ($value instanceof Awaitable) { $value->when(function($e, $v) { $this->resolve($e, $v); }); } else { $this->doResolve($error, $value); } } private function doResolve($error, $value) { foreach ($this->callbacks as $cb) { $cb($error, $value); } } } $awaitables = []; $first = null; $last = null; for ($i = 0; $i < 100000000; $i++) { $awaitable = new Awaitable; if (!$first) { $first = $awaitable; $last = $awaitable; } else { $last->resolve(null, $awaitable); } } $last->resolve(null, 42);

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