ok


    $arr.length: 12
------------------------------------------------
------------------------------------------------

0-......Aardrijkskunde
1-......Geschiedenis
2-......Rekenen
3-......Spelling
4-......Topo
5-......Woordenschat
6-......Engels
7-......Frans
8-......Duits
9-......Spaans
10-......Grieks
11-......Latijns

------------------------------------------------
------------------------------------------------
Array
(
    [0] => Array
        (
            [submap] => Aardrijkskunde
        )

    [1] => Array
        (
            [submap] => Geschiedenis
        )

    [2] => Array
        (
            [submap] => Rekenen
        )

    [3] => Array
        (
            [submap] => Spelling
        )

    [4] => Array
        (
            [submap] => Topo
        )

    [5] => Array
        (
            [submap] => Woordenschat
        )

    [6] => Array
        (
            [submap] => Engels
        )

    [7] => Array
        (
            [submap] => Frans
        )

    [8] => Array
        (
            [submap] => Duits
        )

    [9] => Array
        (
            [submap] => Spaans
        )

    [10] => Array
        (
            [submap] => Grieks
        )

    [11] => Array
        (
            [submap] => Latijns
        )

)

------------------------------------------------
------------------------------------------------
Array
(
    [0] => Array
        (
            [mainmap] => Talen
        )

    [1] => Array
        (
            [mainmap] => Groep4
        )

    [2] => Array
        (
            [mainmap] => Groep5
        )

    [3] => Array
        (
            [mainmap] => Groep6
        )

    [4] => Array
        (
            [mainmap] => Groep7
        )

    [5] => Array
        (
            [mainmap] => Groep8
        )

    [6] => Array
        (
            [submap] => Aardrijkskunde
        )

    [7] => Array
        (
            [submap] => Geschiedenis
        )

    [8] => Array
        (
            [submap] => Rekenen
        )

    [9] => Array
        (
            [submap] => Spelling
        )

    [10] => Array
        (
            [submap] => Topo
        )

    [11] => Array
        (
            [submap] => Woordenschat
        )

    [12] => Array
        (
            [submap] => Engels
        )

    [13] => Array
        (
            [submap] => Frans
        )

    [14] => Array
        (
            [submap] => Duits
        )

    [15] => Array
        (
            [submap] => Spaans
        )

    [16] => Array
        (
            [submap] => Grieks
        )

    [17] => Array
        (
            [submap] => Latijns
        )

)