Composer - Dependycy Management

Composer is a tool for dependency management in PHP. It allows you to declare the dependent libraries your project needs and it will install them in your project for you.

After install something by Composer, DONT FORGET to run the following command:

$ php composer.phar update

Otherwise, it will not reflect the change. Moreover, you can update a specific environment by adding , for example, --dev to the end of command.