tldr/pages/common/composer.md

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# composer
> A package-based dependency manager for PHP projects.
> More information: <https://getcomposer.org/>.
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- Interactively create a `composer.json` file:
`composer init`
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- Add a package as a dependency for this project, adding it to `composer.json`:
`composer require {{user/package_name}}`
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- Install all the dependencies in this project's `composer.json` and create `composer.lock`:
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`composer install`
- Uninstall a package from this project, removing it as a dependency from `composer.json`:
`composer remove {{user/package_name}}`
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- Update all the dependencies in this project's `composer.json` and note versions in `composer.lock` file:
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`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:
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`composer self-update`