Parallel processing made simple.

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v2.0.0 2023-11-25 01:01 UTC

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Last update: 2024-06-25 02:27:35 UTC



AMPHP is a collection of event-driven libraries for PHP designed with fibers and concurrency in mind. amphp/parallel-functions provides a utility function which wraps a callable into another callable which will execute on another process or thread. All data within the callable object or closure must be serializable.

See the Worker and Task interfaces in amphp/parallel for a more flexible and customizable API for running tasks in parallel.

Latest Release License


This package can be installed as a Composer dependency.

composer require amphp/parallel-functions


  • PHP 8.1+



use function Amp\ParallelFunctions\parallelMap;

$responses = parallelMap([
], function ($url) {
    return file_get_contents($url);

Note that file_get_contents() is being used here as an example blocking function (that is, a function which halts the process while awaiting I/O).

We recommend performing HTTP requests using amphp/http-client.

The best functions to parallelize are those which perform many CPU-intensive calcuations or blocking functions which would be difficult or time-consuming to implement in a non-blocking way.

Further examples can be found in the ./examples directory.


amphp/parallel-functions follows the semver semantic versioning specification like all other amphp packages.


If you discover any security related issues, please use the private security issue reporter instead of using the public issue tracker.


The MIT License (MIT). Please see LICENSE for more information.