Array sort

Before sort

Array
(
    [1] => u
    [2] => A
    [3] => A
    [4] => U
    [5] => c
    [6] => A
    [7] => N
    [8] => l
    [9] => B
)

After sort

Array
(
    [0] => A
    [1] => A
    [2] => A
    [3] => B
    [4] => N
    [5] => U
    [6] => c
    [7] => l
    [8] => u
)