Array sort

Before sort

Array
(
    [1] => y
    [2] => Y
    [3] => c
    [4] => a
    [5] => Q
    [6] => 4
    [7] => s
    [8] => x
    [9] => 
)

After sort

Array
(
    [0] => 
    [1] => 4
    [2] => Q
    [3] => Y
    [4] => a
    [5] => c
    [6] => s
    [7] => x
    [8] => y
)