PHP natsort() function

The PHP natsort( ) function is used to sort an array using a "natural order" algorithm. The natsort( ) function implements a sort algorithm but maintains original keys and values. This function was introduced in PHP 4.0.

Syntax

Parameter

Parameter	Description	Is compulsory
array	Specifies the array to sort.	compulsory

Returns

The natsort( ) function returns true on success or false on failure.

Example 1

<?php
$language = array("java 8","php 5","python","Ruby","html");
sort($language);
echo "Standard sorting: ";
print_r($language);
natsort($language);
echo "Natural order: ";
print_r($language);
?>

Output:

Standard sorting: Array
(
    [0] => Ruby
    [1] => html
    [2] => java 8
    [3] =>php 5
    [4] => python
)
Natural order: Array
(
    [0] => Ruby
    [1] => html
    [2] => java 8
    [3] =>php 5
    [4] => python
)

Example 2

<?php
$arr1 = array("code12.php", "code22.php","code2.php", "code3.php", "code1.php");
$arr2 = $arr1;
sort($arr1);
echo "Standard sorting\n";
print_r($arr1);
natsort($arr2);
echo "\nNatural order sorting\n";
print_r($arr2);
?>

Output:

Standard sorting
Array
(
    [0] => code1.php
    [1] => code12.php
    [2] => code2.php
    [3] => code22.php
    [4] => code3.php
)

Natural order sorting
Array
(
    [4] => code1.php
    [2] => code2.php
    [3] => code3.php
    [0] => code12.php
    [1] => code22.php
)

Example 3

<?php
$arr1 = array("java8", "php5","python3", "ruby2", "android7");
$arr2 = $arr1;
sort($arr1);
echo "Standard sorting\n";
print_r($arr1);
natsort($arr2);
echo "\nNatural order sorting\n";
print_r($arr2);
?>

Output:

Standard sorting
Array
(
    [0] => android7
    [1] => java8
    [2] => php5
    [3] => python3
    [4] => ruby2
)
Natural order sorting
Array
(
    [4] => android7
    [0] => java8
    [1] => php5
    [2] => python3
    [3] => ruby2
)

Example 4

<?php
$img1 = array("img12.png", "img10.png", "img2.png", "img1.png");
$img2 = $img1;
sort($img1);
echo "Standard sorting\n";
print_r($img1);
natsort($img2);
echo "\nNatural order sorting\n";
print_r($img2);
?>

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
)

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