Array
(
    [user_id] => Array
        (
            [0] => 6156
            [1] => 7030
            [2] => 656
        )

    [first_name] => Array
        (
            [0] => Diane
            [1] => Fred
            [2] => Helen
        )

    [last_name] => Array
        (
            [0] => Cable
            [1] => Cago
            [2] => Cahalan
        )

)
?: 3
Cable
Diane
Cago
Fred
Cahalan
Helen