Array
(
    [0] => Array
        (
            [product_id] => 457
            [category_id] => 73
        )

    [1] => Array
        (
            [product_id] => 457
            [category_id] => 348
        )

    [2] => Array
        (
            [product_id] => 457
            [category_id] => 350
        )

)
Array
(
    [0] => Array
        (
            [product_id] => 457
            [category_id] => 73
        )

)