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Non PHP expert here, can someone explain to me the line

get => \sprintf("%s_%s", $this->languageCode, $this->countryCode);

in the first code example? Is it a lambda?

Yes, you can read about it the rfc under "Abbreviated syntax"

It follows the syntax of arrow functions

Ahhh, and the backslash is the global namespace, as I just figured out: https://stackoverflow.com/questions/4790020/what-does-a-back...