Arrays within arrays question

I have the following loop to insert data into an array: while ($data = pg_fetch_object($res)) {

    $aProds[] = array('id' => $data->prod_id, 'quantity' => $data->quantity);

} But when I print this out using print_r I get the following: Array (

    [0] => Array
        (
            [0] => Array
                (
                    [id] => 289000100024
                    [quantity] => 1
                )

            [1] => Array
                (
                    [id] => 289000100050
                    [quantity] => 1
                )

        )

) This array has only one element in it; not what I wanted. I wanted something like this: Array (

        [0] => Array
            (
                [id] => 289000100024
                [quantity] => 1
            )
        [1] => Array
            (
                [id] => 289000100050
                [quantity] => 1
            )

) How can I achieve this? Thanks! Jc