Array sort
Before sort
Array
(
[1] => P
[2] => o
[3] => o
[4] => S
[5] => 5
[6] => r
[7] => g
[8] => I
[9] => d
)
After sort
Array
(
[0] => 5
[1] => I
[2] => P
[3] => S
[4] => d
[5] => g
[6] => o
[7] => o
[8] => r
)