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<!DOCTYPE html>
<html>
<body>
​
<?php
$arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200");
echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");
​
print_r($arr1);
echo "<br>";
echo "<br>";
​
echo "Natural order string comparison"."<br>";
usort($arr2,"strnatcmp");
​
print_r($arr2);
?>
​
</body>
</html>
​
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 )