True parallel processing using multiple processes or native threads for concurrent PHP code execution, without blocking, no extensions required.
`amphp/parallel` is a component for [Amp](https://amphp.org) that provides native threading, multiprocessing, process synchronization, shared memory, and task workers for concurrently executing PHP code. Like other Amp components, this library uses [Coroutines](http://amphp.org/amp/coroutines/) built from [Promises](http://amphp.org/amp/promises/) and [Generators](http://www.php.net/manual/en/language.generators.overview.php) to make writing asynchronous code more like writing synchronous code.
To be as flexible as possible, this library comes with a collection of non-blocking concurrency tools that can be used independently as needed, as well as an "opinionated" worker API that allows you to assign units of work to a pool of worker threads or processes.
## Installation
This package can be installed as a [Composer](https://getcomposer.org/) dependency.
```bash
composer require amphp/parallel
```
## Requirements
- PHP 7.0+ (no extensions required)
## Documentation
Documentation can be found on [amphp.org/parallel](https://amphp.org/parallel/) as well as in the [`./docs`](./docs) directory.
## Versioning
`amphp/parallel` follows the [semver](http://semver.org/) semantic versioning specification like all other `amphp` packages.
## Security
If you discover any security related issues, please email [`me@kelunik.com`](mailto:me@kelunik.com) instead of using the issue tracker.
## License
The MIT License (MIT). Please see [`LICENSE`](./LICENSE) for more information.
## Development and Contributing
Want to hack on the source? A [Vagrant](http://vagrantup.com) box is provided with the repository to give a common development environment for running concurrent threads and processes, and comes with a bunch of handy tools and scripts for testing and experimentation.
Starting up and logging into the virtual machine is as simple as
vagrant up && vagrant ssh
Once inside the VM, you can install PHP extensions with [Pickle](https://github.com/FriendsOfPHP/pickle), switch versions with `newphp VERSION`, and test for memory leaks with [Valgrind](http://valgrind.org).