Array sort

Before sort

Array
(
    [1] => 6
    [2] => e
    [3] => 4
    [4] => O
    [5] => q
    [6] => f
    [7] => o
    [8] => R
    [9] => M
)

After sort

Array
(
    [0] => 4
    [1] => 6
    [2] => M
    [3] => O
    [4] => R
    [5] => e
    [6] => f
    [7] => o
    [8] => q
)