PHPのテストです。

Array
(
    [0] => Array
        (
            [0] => 富士通
            [1] => NEC
            [2] => Sony
            [3] => Sharp
        )

    [1] => Array
        (
            [0] => Note
            [1] => Desktop
        )

)
$pc[0][1] = NEC
$pc[1][0] = Note