Authors: Nils Adermann, Jordi Boggiano and many community contributions Sponsored by: Logo by: Max Grigorian Composer and all content on this site are released under the MIT license.

2012年3月1日 · To quickly install Composer in the current directory, run the following script in your terminal. To automate the installation, use the guide on installing Composer …

Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.

To start using Composer in your project, all you need is a composer.json file. This file describes the dependencies of your project and may contain other metadata as well.

To get help from the command-line, call composer or composer list to see the complete list of commands, then --help combined with any of those can give you more information.

Versions and constraints Versions explained. FAQs How do I install a package to a custom path for my framework? How do I install Composer programmatically? How do I install untrusted packages safely? Is it safe to run Composer as superuser or root? How to use Composer behind a proxy Should I commit the dependencies in my vendor directory?

Composer will look in all your repositories to find the packages your project requires. By default, only the Packagist.org repository is registered in Composer.

Packagist is the main package repository for Composer, and it is enabled by default. Anything that is published on Packagist is available automatically through Composer.

As of Composer 2.2.0, the allow-plugins option adds a layer of security allowing you to restrict which Composer plugins are able to execute code during a Composer run.

* * @return string */ function getUserDir() { $userEnv = defined('PHP_WINDOWS_VERSION_MAJOR') ? 'APPDATA' : 'HOME'; $userDir = getenv($userEnv); if (!$userDir) { throw new RuntimeException('The '.$userEnv.' or COMPOSER_HOME environment variable must be set for composer to run correctly'); }