TLDR
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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

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