Array
(
    [0] => Array
        (
            [id] => 2509
            [group_user] => 
        )

)
Array
(
    [0] => Array
        (
            [id] => 2509
            [group_user] => A
        )

    [1] => Array
        (
            [id] => 2508
            [group_user] => 
        )

)