Rob Allen has a a new post to his site today showing how you can cache the merged settings from all of your configuration files combined in a Zend Framework v2 application.
Zend Framework 2's ModuleManager has the ability to cache the merged configuration information for your application. This is very useful as it allows you to separate out your configuration within the config/autoload directory into logical files without worrying about the performance implications of lots of files.
There's some ZF2 configuration options that tell it to cache this data once it's loaded the first time, but he notes one issue with this - caching in development. It can be annoying when you make a change and nothing happens because it's cached. To prevent this he shows you how to only cache if the application is marked as in production (based on the "APPLICATION_ENV"). Separate main configuration files are made for each environment, one that caches and one (for dev) that doesn't.