Structure artobj :
Array
(
    [92] => Array
        (
            [2] => Array
                (
                    [1] => 3
                    [2] => 3
                    [3] => 3
                    [4] => 3
                    [5] => 3
                    [6] => 3
                    [7] => 3
                    [8] => 3
                    [9] => 3
                    [16] => 3
                    [17] => 3
                    [18] => 3
                    [19] => 3
                    [20] => 3
                    [126] => Array
                        (
                            [16] => 26
                        )

                )

        )

)

Exemple : 
$t[92][2][126][16] =26