Guilherme Blanco’s Bisna package integrates Doctrine 2 and Zend Framework 1 using a custom Zend Framework application resource plug: Bisna\Application\Resource\Doctrine
Since configuration settings are stored in application.ini, the developer can easily switch between development and production environments. Bisna\Application\Resource\Doctrine creates the Bisna\Application\Doctrine\Container, the Doctrine Container instance, which it stores in the Zend registry. This is the class you will retrieve and use in your action controllers.
I have written full documentation on how to configure and use Bisna here.
Note: Doctrine 2 requires at least PHP version 5.3.