Use Composer and Symfony Flex to create and manage Symfony applications.

`Composer`_ is the package manager used by modern PHPapplication to manage

`Composer`_ is the package manager used by modern PHPapplications to manage

their dependencies. `Symfony Flex`_ is a Composer plugin designed to automate

some of the most common tasks performed in Symfony applications. Using Flex is

optional but recommended because it improves your productivity significantly.