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Showing content from https://docs.aws.amazon.com/aws-sdk-php/v3/api/class-GuzzleHttp.Promise.PromiseInterface.html below:

AWS SDK for PHP 3.x

PromiseInterface

A promise represents the eventual result of an asynchronous operation.

The primary way of interacting with a promise is through its then method, which registers callbacks to receive either a promise’s eventual value or the reason why the promise cannot be fulfilled.

Tags

see: https://promisesaplus.com/

Table of Contents Constants

FULFILLED = 'fulfilled'
PENDING = 'pending'
REJECTED = 'rejected'

Methods

cancel() : void: Cancels the promise if possible.
getState() : string: Get the state of the promise ("pending", "rejected", or "fulfilled").
otherwise() : PromiseInterface: Appends a rejection handler callback to the promise, and returns a new promise resolving to the return value of the callback if it is called, or to its original fulfillment value if the promise is instead fulfilled.
reject() : void: Reject the promise with the given reason.
resolve() : void: Resolve the promise with the given value.
then() : PromiseInterface: Appends fulfillment and rejection handlers to the promise, and returns a new promise resolving to the return value of the called handler.
wait() : mixed: Waits until the promise completes if possible.

FULFILLED public mixed FULFILLED = 'fulfilled' PENDING public mixed PENDING = 'pending' REJECTED public mixed REJECTED = 'rejected' cancel()

Cancels the promise if possible.

public cancel() : void Tags

see: https://github.com/promises-aplus/cancellation-spec/issues/7

getState()

Get the state of the promise ("pending", "rejected", or "fulfilled").

public getState() : string

The three states can be checked against the constants defined on PromiseInterface: PENDING, FULFILLED, and REJECTED.

Return valuesstring otherwise()

Appends a rejection handler callback to the promise, and returns a new promise resolving to the return value of the callback if it is called, or to its original fulfillment value if the promise is instead fulfilled.

public otherwise(callable $onRejected) : PromiseInterface Parameters

$onRejected : callable: Invoked when the promise is rejected.

Return valuesPromiseInterface reject()

Reject the promise with the given reason.

public reject(mixed $reason) : void Parameters

$reason : mixed

Tags

throws: RuntimeException
if the promise is already resolved.

resolve()

Resolve the promise with the given value.

public resolve(mixed $value) : void Parameters

$value : mixed

Tags

throws: RuntimeException
if the promise is already resolved.

then()

Appends fulfillment and rejection handlers to the promise, and returns a new promise resolving to the return value of the called handler.

public then([callable $onFulfilled = null ][, callable $onRejected = null ]) : PromiseInterface Parameters

$onFulfilled : callable = null: Invoked when the promise fulfills.
$onRejected : callable = null: Invoked when the promise is rejected.

Return valuesPromiseInterface wait()

Waits until the promise completes if possible.

public wait([bool $unwrap = true ]) : mixed

Pass $unwrap as true to unwrap the result of the promise, either returning the resolved value or throwing the rejected exception.

If the promise cannot be waited on, then the promise will be rejected.

Parameters

$unwrap : bool = true

Tags

throws: LogicException
if the promise has no wait function or if the promise does not settle after waiting.

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