define('CONFIG_CODES', 'v1,v2,v3');

Array
(
    [v1] => Array
        (
            [0] =>
            [1] =>
        )

    [v2] => Array
        (
            [0] =>
            [1] =>
        )

    [v3] => Array
        (
            [0] =>
            [1] =>
        )

)