Composer

Composer is the standard dependency manager for PHP, handling library installation and versioning via a central repository.

Composer streamlines PHP development by managing project-specific dependencies through a simple composer.json configuration file. It resolves version constraints using the Packagist repository (hosting over 350,000 packages) and generates a lock file to ensure environment parity across teams. By automating autoloading and updates, it eliminates manual library management for frameworks like Laravel, Symfony, and Drupal.

https://getcomposer.org