guzzlehttp/promises is a small promise library used by Guzzle for asynchronous operations. It implements promise chaining, synchronous waiting, cancellation, and helpers for working with groups of promises.

Most application developers use this package through guzzlehttp/guzzle by calling methods such as requestAsync(). Install this package directly when you need promise composition without the full HTTP client.

composer require guzzlehttp/promises

use GuzzleHttp\Promise\Promise;
use GuzzleHttp\Promise\Utils;

$promise = new Promise();

$promise->then(
    function ($value) {
        echo 'Fulfilled: ' . $value;
    },
    function ($reason) {
        echo 'Rejected: ' . $reason;
    }
);

$promise->resolve('done');
Utils::queue()->run();

You can wait for a promise to complete synchronously:

$value = $promise->wait();

When using Guzzle HTTP requests, asynchronous methods return GuzzleHttp\Promise\PromiseInterface instances:

$promise = $client->requestAsync('GET', 'https://example.com');
$response = $promise->wait();

• Promise Quick Start
• Promise API
• Promise Interoperability
• Implementation Notes
• Upgrade Guide
• Changelog

If you discover a security vulnerability within this package, please send an email to security@tidelift.com. All security vulnerabilities will be promptly addressed. Please do not disclose security-related issues publicly until a fix has been announced. Please see Security Policy for more information.

Guzzle is made available under the MIT License (MIT). Please see License File for more information.

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