The extensions are adding functionalities to the facilities provided by Doctrine, a DB abstraction layer and Object Relational Mapper for PHP.
The extensions are adding functionalities to the facilities provided by Doctrine, a DB abstraction layer and Object Relational Mapper for PHP. Through the ORM facilities, it allows to have automatic operations taking place during certain events (updating database, etc...)
It is setup as a bundle for Symfony 2 and as a module for ZendFramework, at least.