natcasesort in PHP

PHP natcasesort() function is used to sort an array by using a "natural order" algorithm. Here values keep their original keys.
This function is case-insensitive, returns TRUE on success, or FALSE on failure.

Syntax:

natcasesort(array)

array : Required. Specifies the array to use.

Example:

<?php
$temp_files = array( "temp3.txt","Temp13.txt","temp22.txt","Temp18.txt","temp9.txt" );
natsort($temp_files);
echo "Natural order : ";
print_r($temp_files);
echo "<br />";
natcasesort ($temp_files);
echo "Natural order case insensitive :";
print_r($temp_files);
?>

O/P:

Natural order :
 Array (
         [0] => Temp13.txt 
         [1] => Temp18.txt 
         [2] => temp3.txt 
         [3] => temp9.txt 
         [4] => temp22.txt
       )
Natural order case insensitive :
Array (
        [0] => temp3.txt
        [1] => temp9.txt
        [2] => Temp13.txt 
        [3] => Temp18.txt 
        [4] => temp22.txt
       )