How to Set Environment in Symfony

Every application is the combination of code and a set of configuration that dictates how that code should function. The configuration may define the database being used, if something should be cached or how verbose logging should be.

In Symfony, the idea of “environments” is the idea that the same codebase can be run using multiple different configurations. For example, the dev environment should use configuration that makes development easy and friendly, while the prod environment should use a set of configuration optimized for speed.