Standard string comparison
Array
(
[0] => pic01
[1] => pic1
[2] => pic10
[3] => pic100
[4] => pic2
[5] => pic20
[6] => pic200
[7] => pic30
)
Natural order string comparison
Array
(
[0] => pic01
[1] => pic1
[2] => pic2
[3] => pic10
[4] => pic20
[5] => pic30
[6] => pic100
[7] => pic200
)