Amp is a non-blocking concurrency framework for PHP. It provides an event loop, promises and streams as a base for asynchronous programming.
Promises in combination with generators are used to build coroutines, which allow writing asynchronous code just like synchronous code, without any callbacks.
## Installation
This package can be installed as a [Composer](https://getcomposer.org/) dependency.
```bash
composer require amphp/amp
```
## Documentation
Documentation can be found on [amphp.org](https://amphp.org/) as well as in the [`./docs`](./docs) directory.
## Requirements
- PHP 7.0+
##### Optional Extension Backends
Extensions are only needed if your app necessitates a high numbers of concurrent socket connections.
- [ev](https://pecl.php.net/package/ev)
- [event](https://pecl.php.net/package/event)
- [php-uv](https://github.com/bwoebi/php-uv) (experimental fork)
## Examples
This simple example uses our [Artax](https://amphp.org/artax/) HTTP client to fetch multiple HTTP resources concurrently.
```php
setOption(Amp\Artax\Client::OP_DISCARD_BODY, true);
try {
foreach ($uris as $uri) {
$promises[$uri] = $client->request($uri);
}
$responses = yield $promises;
foreach ($responses as $uri => $response) {
print $uri . " - " . $response->getStatus() . $response->getReason() . PHP_EOL;
}
} catch (Amp\Artax\HttpException $error) {
// If something goes wrong Amp will throw the exception where the promise was yielded.
// The Client::request() method itself will never throw directly, but returns a promise.
print $error->getMessage() . PHP_EOL;
}
});
```
Further examples can be found in the [`./examples`](./examples) directory of this repository as well as in the `./examples` directory of [our other libraries](https://github.com/amphp?utf8=%E2%9C%93&q=&type=public&language=php)
## Versioning
`amphp/amp` follows the [semver](http://semver.org/) semantic versioning specification like all other `amphp` packages.
| Version | Bug Fixes Until | Security Fixes Until |
| ------- | --------------- | -------------------- |
| 2.x | TBA | TBA |
| 1.x | 2017-12-31 | 2018-12-31 |
## Compatible Packages
Compatible packages should use the [`amphp`](https://github.com/search?utf8=%E2%9C%93&q=topic%3Aamphp) topic on GitHub.
## Security
If you discover any security related issues, please email [`bobwei9@hotmail.com`](mailto:bobwei9@hotmail.com) or [`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.