Dependency Manager for PHP
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Composer - Package Management for PHP

Composer is a package manager tracking local dependencies of your projects and libraries.

See the about page on for more information.

Build Status

Installation / Usage

  1. Download the composer.phar executable or use the installer.

    $ curl -s | php
  2. Create a composer.json defining your dependencies. Note that this example is a short version for applications that are not meant to be published as packages themselves. To create libraries/packages please read the guidelines.

        "require": {
            "monolog/monolog": ">=1.0.0"
  3. Run Composer: php composer.phar install

  4. Browse for more packages on Packagist.

Installation from Source

To run tests, or develop Composer itself, you must use the sources and not the phar file as described above.

  1. Run git clone
  2. Download the composer.phar executable
  3. Run Composer to get the dependencies: php composer.phar install

Global installation of composer (manual)

Since composer works with the current working directory it is possible to install it in a system wide way.

  1. Change into a directory in your path like cd /usr/local/bin
  2. Get composer curl -s | php
  3. Make the phar executeable chmod a+x composer.phar
  4. Change into a project directory cd /path/to/my/project
  5. Use composer as you normally would composer.phar install
  6. Optionally you can rename the composer.phar to composer to make it easier

Global installation of composer (via homebrew)

Installing via this homebrew formula will always get you the latest composer version.

  1. run brew uninstall composer ; brew install --HEAD
  2. Change into a project directory cd /path/to/my/project
  3. Use composer as you normally would composer.phar install

You will see a warning "Warning: Cannot verify package integrity"; however, this is benign and expected.

Updating composer

Running php composer.phar self-update or equivalent will update a phar install with the latest version.


Additional options for composer can be configured in composer.json by using the config section.

    "config": {
        "vendor-dir": "custom/path/for/vendor"
  • vendor-dir: The location to install vendor packages. The location can be supplied as an absolute or relative path but must be within the current working directory.


All code contributions - including those of people having commit access - must go through a pull request and approved by a core developer before being merged. This is to ensure proper review of all the code.

Fork the project, create a feature branch, and send us a pull request.

To ensure a consistent code base, you should make sure the code follows the Coding Standards which we borrowed from Symfony.

If you would like to help take a look at the list of issues.


The developer mailing list is on google groups IRC channels are available for discussion as well, on #composer for users and #composer-dev for development.


PHP 5.3+


Nils Adermann - - -
Jordi Boggiano - - -

See also the list of contributors who participated in this project.


Composer is licensed under the MIT License - see the LICENSE file for details


This project's Solver started out as a PHP port of openSUSE's Libzypp satsolver.