natsort Sort an array using a "natural order" algorithm voidnatsort arrayarray 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: ]]> The code above will generate the following output: 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. If you're wanting to maintain index/value associations, consider using uasort($arr, 'strnatcmp'). See also natcasesort, strnatcmp, and strnatcasecmp.