then([$promise, 'resolve'], [$promise, 'reject']); return $promise; } return new FulfilledPromise($value); } /** * Creates a rejected promise for a reason if the reason is not a promise. * If the provided reason is a promise, then it is returned as-is. * * @param mixed $reason Promise or reason. */ public static function rejectionFor($reason): PromiseInterface { if ($reason instanceof PromiseInterface) { return $reason; } return new RejectedPromise($reason); } /** * Create an exception for a rejected promise value. * * @param mixed $reason */ public static function exceptionFor($reason): \Throwable { if ($reason instanceof \Throwable) { return $reason; } return new RejectionException($reason); } /** * Returns an iterator for the given value. * * @param mixed $value */ public static function iterFor($value): \Iterator { if ($value instanceof \Iterator) { return $value; } if (is_array($value)) { return new \ArrayIterator($value); } return new \ArrayIterator([$value]); } }