sort multidimensional arrays by field specified.
specify the key by which you want your multiarray sorted.

Array
(
    [0] => Array
        (
            [0] => news
            [1] => 1234567894
            [2] => qwenb
            [3] => asbhtyhj
        )

    [1] => Array
        (
            [0] => news
            [1] => 1234567890
            [2] => sdf
            [3] => asdpojq
        )

    [2] => Array
        (
            [0] => comment
            [1] => 1234567893
            [2] => fghj
            [3] => mjktyu
        )

    [3] => Array
        (
            [0] => article
            [1] => 1234567891
            [2] => cvmo
            [3] => pjklgg
        )

    [4] => Array
        (
            [0] => news
            [1] => 1234567892
            [2] => uruy
            [3] => xbuqiwpo
        )

)