Array sort

Before sort

Array
(
    [1] => K
    [2] => i
    [3] => f
    [4] => P
    [5] => U
    [6] => 6
    [7] => I
    [8] => v
    [9] => u
)

After sort

Array
(
    [0] => 6
    [1] => I
    [2] => K
    [3] => P
    [4] => U
    [5] => f
    [6] => i
    [7] => u
    [8] => v
)