natsort

(PHP4 >= 4.0RC2)

natsort --  Sort an array using a "natural order" algorithm

Description

void natsort (array array)

This function implements a sort algorithm that orders alphanumeric strings in the way a human being would. This is described as a "natural ordering". An example of the difference between this algorithm and the regular computer string sorting algorithms (used in sort()) can be seen below:

Example 1. natsort() example


$array1 = $array2 = array ("img12.png","img10.png","img2.png","img1.png");          

sort($array1);
echo "Standard sorting\n";
print_r($array1);

natsort($array2);
echo "\nNatural order sorting\n";
print_r($array2);
      

The code above will generate the following output:


Standard sorting
Array
(
    [0] => img1.png
    [1] => img10.png
    [2] => img12.png
    [3] => img2.png
)

Natural order sorting
Array
(
    [3] => img1.png
    [2] => img2.png
    [1] => img10.png
    [0] => img12.png
)
      

For more infomation see: Martin Pool's Natural Order String Comparison page.

See also natcasesort(), strnatcmp() and strnatcasecmp().