Natural sorting of PHP array in reverse and not preserving keys

Question

I'm look to naturally sort an array, in reverse order and not preserve the keys. For example, I'd like this array:

[0] => 1-string
[1] => 2-string
[2] => 10-string
[3] => 4-srting
[4] => 3-srting

To end up like this:

[0] => 10-srting
[1] => 4-string
[2] => 3-string
[3] => 2-string
[4] => 1-string

I've got it close with usort($array, 'strnatcmp'); but it's not in reverse order. array_reverse() after doesn't help.

Any ideas?

Answer 1

I'm a bit puzzled about "array_reverse() after doesn't help." because

<?php
echo PHP_VERSION, "\n";

$x = array( 
    '1-string',
    '2-string',
    '10-string',
    '4-srting',
    '3-srting'
);

natsort($x);
$x = array_reverse($x, false);
print_r($x);

prints

5.3.8
Array
(
    [0] => 10-string
    [1] => 4-srting
    [2] => 3-srting
    [3] => 2-string
    [4] => 1-string
)

on my machine

Answer 2

Use the $preserveKeys attribute of array_reverse() to reset the keys as well as reversing the array after a natcasesort().

function rnatcasesort(&$array) {
    natcasesort($array);
    $array = array_reverse($array, false);
}

$values = array('1-string', '2-string', '10-string', '4-string', '3-string');

rnatcasesort($values);

var_dump($values);

/*
array(5) {
  [0]=>
  string(9) "10-string"
  [1]=>
  string(8) "4-string"
  [2]=>
  string(8) "3-string"
  [3]=>
  string(8) "2-string"
  [4]=>
  string(8) "1-string"
}
*/

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