Array sort

Before sort

Array
(
    [1] => e
    [2] => k
    [3] => k
    [4] => Z
    [5] => o
    [6] => J
    [7] => N
    [8] => X
    [9] => W
)

After sort

Array
(
    [0] => J
    [1] => N
    [2] => W
    [3] => X
    [4] => Z
    [5] => e
    [6] => k
    [7] => k
    [8] => o
)