Array sort

Before sort

Array
(
    [1] => B
    [2] => N
    [3] => p
    [4] => 1
    [5] => t
    [6] => t
    [7] => M
    [8] => g
    [9] => 4
)

After sort

Array
(
    [0] => 1
    [1] => 4
    [2] => B
    [3] => M
    [4] => N
    [5] => g
    [6] => p
    [7] => t
    [8] => t
)