tldr/pages/common/composer.md

composer

A package-based dependency manager for PHP projects. More information: https://getcomposer.org/.

• Interactively create a composer.json file:

composer init

• Add a package as a dependency for this project, adding it to composer.json:

composer require {{user/package_name}}

• Install all the dependencies in this project's composer.json and create composer.lock:

composer install

• Uninstall a package from this project, removing it as a dependency from composer.json:

composer remove {{user/package_name}}

• Update all the dependencies in this project's composer.json and note versions in composer.lock file:

composer update

• Update composer lock only after updating composer.json manually:

composer update --lock

• Learn more about why a dependency can't be installed:

composer why-not {{user/package_name}}

• Update composer to its latest version:

composer self-update