Array sort

Before sort

Array
(
    [1] => k
    [2] => 9
    [3] => 0
    [4] => I
    [5] => 6
    [6] => 1
    [7] => k
    [8] => 3
    [9] => 2
)

After sort

Array
(
    [0] => 0
    [1] => 1
    [2] => 2
    [3] => 3
    [4] => 6
    [5] => 9
    [6] => I
    [7] => k
    [8] => k
)