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# natsort

(PHP 4 , PHP 5)

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:

示範 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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