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49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
---
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title: Parallel processing for PHP
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permalink: /
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---
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This package provides *true parallel processing* for PHP using multiple processes or native threads, *without blocking and no extensions required*.
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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/parallel
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```
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## Usage
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The basic usage of this library is to submit blocking tasks to be executed by a worker pool in order to avoid blocking the main event loop.
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```php
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<?php
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require __DIR__ . '/../vendor/autoload.php';
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use Amp\Parallel\Worker;
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use Amp\Promise;
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$urls = [
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'https://secure.php.net',
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'https://amphp.org',
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'https://github.com',
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];
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$promises = [];
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foreach ($urls as $url) {
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$promises[$url] = Worker\enqueueCallable('file_get_contents', $url);
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}
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$responses = Promise\wait(Promise\all($promises));
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foreach ($responses as $url => $response) {
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\printf("Read %d bytes from %s\n", \strlen($response), $url);
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}
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```
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[`file_get_contents`](https://secure.php.net/file_get_contents) is just used as an example for a blocking function here.
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If you just want to fetch multiple HTTP resources concurrently, it's better to use [Artax](https://amphp.org/artax/), our non-blocking HTTP client.
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The functions you call must be predefined or autoloadable by Composer so they also exist in the worker processes.
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Instead of simple callables, you can also [enqueue `Task` instances](./workers#task) with `Amp\Parallel\Worker\enqueue()`. |