Array
(
    [0] => Array
        (
            [item_id] => 6450
            [promotion_id] => 1009
        )

    [1] => Array
        (
            [item_id] => 6450
            [promotion_id] => 1153
        )

    [2] => Array
        (
            [item_id] => 6450
            [promotion_id] => 1516
        )

)