Installing Composer in Docker the 2020-s Way
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:category:  PHP
:date:      2023-01-11 10:14:00 +0200
:tags:      docker, composer

While `the original way`__ is still valid, in Docker it's now easier to copy the Composer executable from its Docker image.

.. __: link://slug/install-composer-in-docker

.. code-block:: docker

    COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer

or for PHP < 7.2.5

.. code-block:: docker

    COPY --from=composer:2.2 /usr/bin/composer /usr/local/bin/composer

Please note that without the installer, dependencies won't be checked, so you also need to install git and/or zip,
and preferably optional dependencies like mbstring too.

Found accidentally `on the Stack Overflow`__.
There is also `another interesting and underliked method`__ for the case
when you don't want to keep the composer executable and cache files in your image.

.. __: https://stackoverflow.com/a/58694421
.. __: https://stackoverflow.com/a/68600278