string
Array
(
    [client_id] => 3
    [0] => 3
    [product_id] => 37
    [1] => 37
)
Array
(
    [client_id] => 3
    [0] => 3
    [product_id] => 40
    [1] => 40
)
Array
(
    [client_id] => 1
    [0] => 1
    [product_id] => 49
    [1] => 49
)
Array
(
    [client_id] => 1
    [0] => 1
    [product_id] => 41
    [1] => 41
)
Array
(
    [client_id] => 1
    [0] => 1
    [product_id] => 43
    [1] => 43
)