PHP Benefits of Using Composer


Composer tracks which versions of packages you have installed in a file called composer.lock, which is intended to be committed to version control, so that when the project is cloned in the future, simply running composer install will download and install all the project's dependencies.

Composer deals with PHP dependencies on a per-project basis. This makes it easy to have several projects on one machine that depend on separate versions of one PHP package.

Composer tracks which dependencies are only intended for dev environments only

composer require --dev phpunit/phpunit

Composer provides an autoloader, making it extremely easy to get started with any package. For instance, after installing Goutte with composer require fabpot/goutte, you can immediately start to use Goutte in a new project:


require __DIR__ . '/vendor/autoload.php';

$client = new Goutte\Client();

// Start using Goutte

Composer allows you to easily update a project to the latest version that is allowed by your composer.json. EG. composer update fabpot/goutte, or to update each of your project's dependencies: composer update.