composer:tldr:ac0f9

The command composer require ${user-package_name} is used in the context of Composer, a dependency management tool for PHP. It adds and installs a new package to your PHP project.

Here's how the command works:

1. composer require is the command itself. It is used to add new packages to your project.
2. ${user-package_name} is a placeholder for the name of the package you want to add. You would replace it with the actual name of the package you want to install.
3. When you run the command, Composer will look for the package name you provided in the configured package repositories (e.g., Packagist, private repositories).
4. If the package is found, Composer will retrieve its information (version, dependencies, etc.) and analyze it to determine the requirements and dependencies needed.
5. Composer then downloads the package and its dependencies from the repository and places them in your project's "vendor" directory.
6. Finally, Composer updates the "composer.json" file in your project, adding the new package to the "require" section. It also generates an accompanying "composer.lock" file, which locks the installed package versions to ensure consistency.

After running the command, you can start using the package in your PHP project by including the necessary autoload files and utilizing the package's functionality.