Array
(
    [0] => Array
        (
            [filterveld] => merk
            [filterkey] => 1964
        )

    [1] => Array
        (
            [filterveld] => model
            [filterkey] => 40
        )

    [2] => Array
        (
            [filterveld] => model
            [filterkey] => Array
                (
                    [0] => 40
                )

        )

    [3] => Array
        (
            [filterveld] => rve_caption
            [filterkey] => Array
                (
                    [0] => 1959
                    [1] => 1401
                    [2] => 2034
                    [3] => 1808
                )

        )

    [4] => Array
        (
            [filterveld] => mouwlengte
            [filterkey] => 1050
        )

)