Drupal 7 - Symfony - Dependency injection
This project has been maturing enough to fill those needs:
- brings the Symfony 3 dependency injection container to Drupal 7 ;
- brings a Drupal 8 forward-compatibility layer for easier module porting ;
- brings the ability to use Symfony bundles into Drupal 7 as long as they use a limited set of Symfony features.
Then you may read the documentation: