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96 lines
4.6 KiB
Markdown
96 lines
4.6 KiB
Markdown
<a href="https://amphp.org/">
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<img src="https://github.com/amphp/logo/blob/master/repos/amp-logo-with-margin.png?raw=true" width="250" align="right" alt="Amp Logo">
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</a>
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<a href="https://amphp.org/"><img alt="Amp" src="https://github.com/amphp/logo/blob/master/repos/amp-text.png?raw=true" width="100" valign="middle"></a>
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Amp is a non-blocking concurrency framework for PHP. It provides an event loop, promises and streams as a base for asynchronous programming.
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Promises in combination with generators are used to build coroutines, which allow writing asynchronous code just like synchronous code, without any callbacks.
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<a href="https://travis-ci.org/amphp/amp"><img src="https://img.shields.io/travis/amphp/amp/master.svg?style=flat-square" valign="middle"></a>
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<a href="https://coveralls.io/github/amphp/amp?branch=master"><img src="https://img.shields.io/coveralls/amphp/amp/master.svg?style=flat-square" valign="middle"></a>
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<a href="blob/master/LICENSE"><img src="https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square" valign="middle"></a>
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## Motivation
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Traditionally, PHP has a synchronous execution flow, doing one thing at a time.
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If you query a database, you send the query and wait for the response from the database server in a blocking manner.
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Once you have the response, you can start doing the next thing.
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Instead of sitting there and doing nothing while waiting, we could already send the next database query, or do an HTTP call to an API.
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Making use of the time we usually spend on waiting for I/O can speed up the total execution time.
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The following diagram shows the execution flow with dependencies between the different tasks, once executed sequentially and once concurrently.
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Amp allows such concurrent I/O operations while keeping the cognitive load low by avoiding callbacks.
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Instead, the results of asynchronous operations can be awaited using `yield` resulting in code which is structured like traditional blocking I/O code while the actual execution flow is handled by Amp.
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## Installation
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This package can be installed as a [Composer](https://getcomposer.org/) dependency.
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```bash
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composer require amphp/amp
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```
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This installs the basic building blocks for asynchronous applications in PHP.
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We offer a lot of repositories building on top of this repository, e.g.
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- [`amphp/byte-stream`](https://github.com/amphp/byte-stream) providing a stream abstraction
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- [`amphp/socket`](https://github.com/amphp/socket) providing a socket layer for UDP and TCP including TLS
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- [`amphp/parallel`](https://github.com/amphp/parallel) providing parallel processing to utilize multiple CPU cores and offload blocking operations
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- [`amphp/http-client`](https://github.com/amphp/http-client) providing an HTTP/1.1 and HTTP/2 client
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- [`amphp/http-server`](https://github.com/amphp/http-server) providing an HTTP/1.1 and HTTP/2 application server
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- [`amphp/mysql`](https://github.com/amphp/mysql) and [`amphp/postgres`](https://github.com/amphp/postgres) for non-blocking database access
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- and [many more packages](https://github.com/amphp?type=source)
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## Documentation
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Documentation can be found on [amphp.org](https://amphp.org/) as well as in the [`./docs`](./docs) directory.
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Each packages has it's own `./docs` directory.
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## Requirements
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This package requires PHP 7.0 or later.
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Many of the other packages raised their requirement to PHP 7.1.
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No extensions required!
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##### Optional Extensions
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Extensions are only needed if your app necessitates a high numbers of concurrent socket connections, usually this limit is configured up to 1024 file descriptors.
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- [`ev`](https://pecl.php.net/package/ev)
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- [`event`](https://pecl.php.net/package/event)
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- [`uv`](https://github.com/bwoebi/php-uv)
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## Examples
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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).
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## Versioning
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`amphp/amp` follows the [semver](http://semver.org/) semantic versioning specification like all other `amphp` packages.
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##### 2.x
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Supported. We don't have plans to release v3, yet.
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##### 1.x
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No longer supported. We stopped providing bug fixes 2017-12-31 and stopped providing security fixes 2018-12-31.
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## Compatible Packages
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Compatible packages should use the [`amphp`](https://github.com/search?utf8=%E2%9C%93&q=topic%3Aamphp) topic on GitHub.
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## Security
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If you discover any security related issues, please email [`me@kelunik.com`](mailto:me@kelunik.com) instead of using the issue tracker.
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## License
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The MIT License (MIT). Please see [`LICENSE`](./LICENSE) for more information.
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