Symfony is a PHP framework to speed up the creation and maintenance of your web applications.
By using existing ‘de facto’ standards of PHP, such as PHPUnit, and naming conventions for classes, you’re not confined within the Symfony environment, but instead, have the freedom to choose the software components that you want to use.
It provides a set of prefabricated components that can be rapidly integrated into your application, combined with a clear methodology to help you work both efficiently and effectively on the most complex tasks.
The use of Best Practices guarantees the stability, maintainability, and upgrade-ability of any application you develop.
You can choose the Full Stack (complete) version if you want to develop a complex application, or Brick by Brick, to build your own framework according to the functionality you need, or Micro-framework, as a standalone used to develop specific functionality in your project.