Check if a country is an EU country in Magento

I you ever wondered how you can check if a Country, resp. a Country Code, is in the EU, i did the following:

Magento has a config value: eu_countries that lists all Countries of the EU.

You can find it in the backend under:
Configuration -> General -> Country Options.

Against this list you can validate your country code, f.e. that you got in an billing or shipping address of an order.

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