Assuming that you are using APPLICATION_ENV as part of Zend_Application, then you could add this in either your . Htaccess or main Apache config (assuming Apache is in use - should still be possible with different Web servers too).
We define an environment variable (ENVPHP), and use this in our XML configuration files, so the correct DB parameters are loaded as long as you define the correct ENVPHP environment variable. Using XML you can extend (or override) your common parameters with those for the specific environments.
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