How in PDOStatement->fetchAll use PDO::FETCH_GROUP for grouping more than one column simultaneously?

[ÐÐÑÐÐÐ ÐÐÐÑÐÐÐÐ <mikhail.v.gavrilov@xxxxxxxxx>]

How in PDOStatement->fetchAll use PDO::FETCH_GROUP for grouping more
than one column simultaneously?

For example

col1  col2  col3  col4
13     p1       1     boroda
13     p1       1     boroda 2
13     p1       2     boroda 3
13     p2       2     boroda 4
13     p2       2     boroda 5
14     p3       2     boroda 6
14     p4       2     boroda 7
14     p4       2     boroda 8

$data = $sth->fetchAll(PDO::FETCH_ASSOC | PDO::FETCH_GROUP, 2);

Expected result for $data:

Array
(
    [13] => Array
        (
             [p1] => Array
                   (
                         [0] => Array
                             (
                                [col3] => 1
                                [col4] => boroda
                             )
                         [1] => Array
                             (
                                [col3] => 1
                                [col4] => boroda 2
                             )
                         [2] => Array
                             (
                                [col3] => 2
                                [col4] => boroda 3
                             )
                        )
                    [p2] => Array
                        (
                         [0] => Array
                             (
                                [col3] => 2
                                [col4] => boroda 4
                             )
                         [1] => Array
                             (
                                [col3] => 2
                                [col4] => boroda 5
                             )
                   )
         )
    [14] => Array
        (
             [p3] => Array
                   (
                         [0] => Array
                             (
                                [col3] => 2
                                [col4] => boroda 6
                             )
                   )
             [p4] => Array
                   (
                         [0] => Array
                             (
                                [col3] => 2
                                [col4] => boroda 7
                             )
                         [1] => Array
                             (
                                [col3] => 2
                                [col4] => boroda 8
                             )

                   )
         )

--
Best Regards,
Mike Gavrilov.

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