Array sort

Before sort

Array
(
    [1] => w
    [2] => I
    [3] => 7
    [4] => 3
    [5] => U
    [6] => e
    [7] => b
    [8] => B
    [9] => s
)

After sort

Array
(
    [0] => 3
    [1] => 7
    [2] => B
    [3] => I
    [4] => U
    [5] => b
    [6] => e
    [7] => s
    [8] => w
)