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95 lines
4.3 KiB
Markdown
95 lines
4.3 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 set of seamlessly integrated concurrency libraries for PHP based on [Revolt](https://revolt.run/). This package
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provides futures and cancellations as a base for asynchronous programming.
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Amp makes heavy use of fibers shipped with PHP 8.1 to write asynchronous code just like synchronous, blocking code. In
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contrast to earlier versions, there's no need for generator based coroutines or callbacks. Similar to threads, each
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fiber has its own call stack, but fibers are scheduled cooperatively by the event loop. Use `Amp\async()` to run things
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concurrently.
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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. If you query a database, you send the
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query and wait for the response from the database server in a blocking manner. Once you have the response, you can start
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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
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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. The following diagram
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shows the execution flow with dependencies between the different tasks, once executed sequentially and once
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concurrently.
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Amp allows such concurrent I/O operations while keeping the cognitive load low by avoiding callbacks. Instead, the
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results of asynchronous operations can be awaited using `Future::await()` resulting in code which is structured like
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traditional blocking I/O code.
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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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If you use this library, it's very likely you want to schedule events using [Revolt's event loop](https://revolt.run),
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which you should require separately, even if it's automatically installed as a dependency.
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```bash
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composer require revolt/event-loop
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```
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These packages provide the basic building blocks for asynchronous applications in PHP. We offer a lot of repositories
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building on top of these repositories, 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
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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
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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. Each
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packages has it's own `./docs` directory.
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## Requirements
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This package requires PHP 8.0 (with [`ext-fiber`](https://github.com/amphp/ext-fiber)), or PHP 8.1 or later. No
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extensions required!
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##### Optional Extensions
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[Extensions](https://revolt.run/extensions) are only needed if your app necessitates a high numbers of concurrent socket
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connections, usually this limit is configured up to 1024 file descriptors.
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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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## 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
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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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