- Dependency management
- System Requirements
- Installation - Linux / Unix / macOS
- Installation - Windows
- Docker Image
- Using 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.
Composer is not a package manager in the same sense as Yum or Apt are. Yes,
it deals with "packages" or libraries, but it manages them on a per-project
basis, installing them in a directory (e.g.
vendor) inside your project. By
default, it does not install anything globally. Thus, it is a dependency
manager. It does however support a "global" project for convenience via the
- You have a project that depends on a number of libraries.
- Some of those libraries depend on other libraries.
- Enables you to declare the libraries you depend on.
- Finds out which versions of which packages can and need to be installed, and installs them (meaning it downloads them into your project).
- You can update all your dependencies in one command.
See the Basic usage chapter for more details on declaring dependencies.
Composer in its latest version requires PHP 7.2.5 to run. A long-term-support version (2.2.x) still offers support for PHP 5.3.2+ in case you are stuck with a legacy PHP version. A few sensitive php settings and compile flags are also required, but when using the installer you will be warned about any incompatibilities.
Composer needs several supporting applications to work effectively, making the
process of handling package dependencies more efficient. For decompressing
files, Composer relies on tools like
xz. As for version control systems, Composer integrates seamlessly
with Fossil, Git, Mercurial, Perforce and Subversion, thereby ensuring the
application's smooth operation and management of library repositories. Before
using Composer, ensure that these dependencies are correctly installed on your
Composer is multi-platform and we strive to make it run equally well on Windows, Linux and macOS.
Installation - Linux / Unix / macOS#
Downloading the Composer Executable#
Composer offers a convenient installer that you can execute directly from the command line. Feel free to download this file or review it on GitHub if you wish to know more about the inner workings of the installer. The source is plain PHP.
There are, in short, two ways to install Composer. Locally as part of your project, or globally as a system wide executable.
To install Composer locally, run the installer in your project directory. See the Download page for instructions.
The installer will check a few PHP settings and then download
to your working directory. This file is the Composer binary. It is a PHAR
(PHP archive), which is an archive format for PHP which can be run on
the command line, amongst other things.
php composer.phar in order to run Composer.
You can install Composer to a specific directory by using the
option and additionally (re)name it as well using the
--filename option. When
running the installer when following
the Download page instructions add the
php composer-setup.php --install-dir=bin --filename=composer
php bin/composer in order to run Composer.
You can place the Composer PHAR anywhere you wish. If you put it in a directory
that is part of your
PATH, you can access it globally. On Unix systems you
can even make it executable and invoke it without directly using the
After running the installer following the Download page instructions you can run this to move composer.phar to a directory that is in your path:
mv composer.phar /usr/local/bin/composer
If you like to install it only for your user and avoid requiring root permissions,
you can use
~/.local/bin instead which is available by default on some
Note: If the above fails due to permissions, you may need to run it again with
Note: On some versions of macOS the
/usrdirectory does not exist by default. If you receive the error "/usr/local/bin/composer: No such file or directory" then you must create the directory manually before proceeding:
mkdir -p /usr/local/bin.
Note: For information on changing your PATH, please read the Wikipedia article and/or use your search engine of choice.
composer in order to run Composer instead of
Installation - Windows#
Using the Installer#
This is the easiest way to get Composer set up on your machine.
Download and run
Composer-Setup.exe. It will
install the latest Composer version and set up your PATH so that you can
composer from any directory in your command line.
Note: Close your current terminal. Test usage with a new terminal: This is important since the PATH only gets loaded when the terminal starts.
Change to a directory on your
PATH and run the installer following
the Download page instructions
Create a new
composer.bat file alongside
C:\bin> echo @php "%~dp0composer.phar" %*>composer.bat
PS C:\bin> Set-Content composer.bat '@php "%~dp0composer.phar" %*'
Add the directory to your PATH environment variable if it isn't already. For information on changing your PATH variable, please see this article and/or use your search engine of choice.
Close your current terminal. Test usage with a new terminal:
Composer version 2.4.0 2022-08-16 16:10:48
Composer is published as Docker container in a few places, see the list in the composer/docker README.
docker pull composer/composer
docker run --rm -it -v "$(pwd):/app" composer/composer install
To add Composer to an existing Dockerfile you can simply copy binary file from pre-built, low-size images:
# Latest release
COPY --from=composer/composer:latest-bin /composer /usr/bin/composer
# Specific release
COPY --from=composer/composer:2-bin /composer /usr/bin/composer
Read the image description for further usage information.
Note: Docker specific issues should be filed on the composer/docker repository.
Note: You may also use
composer instead of
composer/composer as image name above. It is shorter and is a Docker official image but is not published directly by us and thus usually receives new releases with a delay of a few days. Important: short-aliased images don't have binary-only equivalents, so for
COPY --from approach it's better to use
Now that you've installed Composer, you are ready to use it! Head on over to the next chapter for a short demonstration.
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