gistfile1.txt

Array
(
    [relation] => AND
    [0] => Array
        (
            [key] => active
            [value] => 1
            [type] => NUMERIC
        )

    [1] => Array
        (
            [key] => quantity
            [value] => 0
            [compare] => >
        )

    [2] => Array
        (
            [relation] => OR
            [0] => Array
                (
                    [key] => brand_name
                    [value] => 'foobar'
                    [compare] => LIKE
                )

            [1] => Array
                (
                    [key] => product_type_name
                    [value] => 'foobar'
                    [compare] => LIKE
                )

        )

)