Array
(
    [prop] => Array
        (
            [2] => Array
                (
                    [0] => 520
                    [1] => 529
                    [2] => 553
                    [3] => 554
                    [4] => 575
                    [5] => 578
                    [6] => 661
                    [7] => 671
                    [8] => 690
                    [9] => 696
                    [10] => 697
                    [11] => 704
                )

        )

)