> It was actually my mistake when I added then. They should have been <env instead of <server for Travis to pick up.
No need. env variables are picked up and passed in ``$_SERVER`` by PHP.

Using ``<env>`` would be confusing when using a real environment variable, because ``$_ENV`` is not always populated with the real environment variables. It depends on your php.ini.

Using ``<server>`` is the way it is done currently in all drivers (except BrowserKitDriver which does not have this setting at all) and it works fine.