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natsort

(PHP 4 )

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 while maintaining key/value associations. 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

<?php
$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 information see: Martin Pool's Natural Order String Comparison page.

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

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