<pre>Array
(
    [aa-t] => Array
        (
            [1] => 11
            [2] => 21
            [3] => 31
            [4] => 
        )

    [bb-t] => Array
        (
            [1] => 12
            [2] => 22
            [3] => 32
        )

    [cc-t] => Array
        (
            [1] => 13
            [2] => 23
            [3] => 33
        )

    [dd-t] => Array
        (
            [1] => 14
            [2] => 24
            [3] => 34
        )

)
</pre>aa-t - bb-t - cc-t - dd-t<br />11 - 12 - 13 - 14<br />21 - 22 - 23 - 24<br />31 - 32 - 33 - 34<br /><pre>Array
(
    [0] => Array
        (
            [0] => aa-t
            [1] => bb-t
            [2] => cc-t
            [3] => dd-t
        )

    [1] => Array
        (
            [0] => 11
            [1] => 12
            [2] => 13
            [3] => 14
        )

    [2] => Array
        (
            [0] => 21
            [1] => 22
            [2] => 23
            [3] => 24
        )

    [3] => Array
        (
            [0] => 31
            [1] => 32
            [2] => 33
            [3] => 34
        )

    [4] => Array
        (
            [0] => 
        )

)
</pre>