Promise

Let's take a look at its interface.

/**
 * @throws Throwable
 *
 * This method is used to create a new promise.
 */
public static function c(callable $callback, bool $justGetResult = false): Promise;

/**
 * This method is used to get the id of the promise.
 */
public function getId(): int;

/**
 * This method is used to get the fiber of the promise.
 */
public function getFiber(): Fiber;

/**
 * This method is used to check if the promise is just to get the result.
 */
public function isJustGetResult(): bool;

/**
 * This method is used to get the time out of the promise.
 */
public function getTimeOut(): float;

/**
 * This method is used to get the time start of the promise.
 */
public function getTimeStart(): float;

/**
 * This method is used to get the time end of the promise.
 */
public function getTimeEnd(): float;

/**
 * This method is used to set the time out of the promise.
 */
public function setTimeEnd(float $timeEnd): void;

/**
 * This method is used to check if the promise is timed out and can be dropped.
 */
public function canDrop(): bool;

/**
 * This method is used to get the status of the promise.
 */
public function getStatus(): string;

/**
 * This method is used to check if the promise is pending.
 */
public function isPending(): bool;

/**
 * This method is used to check if the promise is resolved.
 */
public function isResolved(): bool;

/**
 * This method is used to check if the promise is rejected.
 */
public function isRejected(): bool;

/**
 * This method is used to get the result of the promise.
 */
public function getResult(): mixed;

/**
 * This method is used to get the return when catch or then of the promise is resolved or rejected.
 */
public function getReturn(): mixed;

/**
 * @throws Throwable
 *
 * This method is used to get the callback of the promise.
 */
public function getCallback(): callable;

/**
 * This method is used to resolve the promise.
 */
public function resolve(mixed $value = ''): void;

/**
 * This method is used to reject the promise.
 */
public function reject(mixed $value = ''): void;

/**
 * This method is used to set the callback when the promise is resolved.
 */
public function then(callable $callback): Promise;

/**
 * This method is used to set the callback when the promise is rejected.
 */
public function catch(callable $callback): Promise;

/**
 * This method is used to set the callback when the promise is resolved or rejected.
 */
public function finally(callable $callback): Promise;

/**
 * @throws Throwable
 *
 * This method is used to use the callbacks of the promise.
 */
public function useCallbacks(): void;

/**
 * @throws Throwable
 * @param array<int, Async|Promise|callable> $promises
 * @phpstan-param array<int, Async|Promise|callable> $promises
 */
public static function all(array $promises): Promise;

/**
 * @throws Throwable
 * @param array<int, Async|Promise|callable> $promises
 * @phpstan-param array<int, Async|Promise|callable> $promises
 */
public static function allSettled(array $promises): Promise;

/**
 * @throws Throwable
 * @param array<int, Async|Promise|callable> $promises
 * @phpstan-param array<int, Async|Promise|callable> $promises
 */
public static function any(array $promises): Promise;

/**
 * @throws Throwable
 * @param array<int, Async|Promise|callable> $promises
 * @phpstan-param array<int, Async|Promise|callable> $promises
 */
public static function race(array $promises): Promise;