php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #69330 SORT_* DOESN'T WORK in array_multisort
Submitted: 2015-03-30 07:59 UTC Modified: 2015-03-30 08:56 UTC
From: to dot yashin at gmail dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.5.23 OS: ubuntu
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: to dot yashin at gmail dot com
New email:
PHP Version: OS:

 

 [2015-03-30 07:59 UTC] to dot yashin at gmail dot com 
Description:
------------
The second optional parameter array1_sort_order=SORT_DESC in array_multisort function does not work

Test script:
---------------
<?php

$result = array(
	array(
		'position' => 1,
		'col1' => 10,
		'col2' => 10,
	),
	array(
		'position' => 2,
		'col1' => 12,
		'col2' => 10,
	),
	array(
		'position' => 3,
		'col1' => 10,
		'col2' => 11,
	),
);

$col1_data = array();
$col2_data = array();
foreach ($result as $key => $row) {
	$col1_data[] = intval($row['col1']);
	$col2_data[] = intval($row['col2']);
}
// SORT_DESC !
array_multisort($result, SORT_DESC, SORT_NUMERIC, $col1_data, $col2_data);

foreach ($result as $row) {
	echo $row['position'], ' ';
}
echo "\n";
// Actual: 1 3 2
// Expected: 2 3 1


Expected result:
----------------
Sort Descending correct: 2 3 1

Actual result:
--------------
Sort Descending is not correct: 1 3 2

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2015-03-30 08:16 UTC] to dot yashin at gmail dot com
-Summary: SORT_* DOSNT WORK in array_multisort +Summary: SORT_* DOESN'T WORK in array_multisort
 [2015-03-30 08:16 UTC] to dot yashin at gmail dot com 
//Grammar Nazi DOSNT => DOESN'T
 [2015-03-30 08:51 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2015-03-30 08:51 UTC] requinix@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

array_multisort() works by sorting the arrays in the order given. The first argument is not special - it doesn't represent "the array to be sorted" or anything like that.

You want to sort $result by col1 then by col2. That means you need to provide those two _data* arrays in that order, and of course with the appropriate flags/options. $result doesn't contribute anything to the sort order, but must be included (as the final argument) so that it gets sorted.

Thus you should be calling array_multisort() as
  array_multisort(
    $col1_data, SORT_DESC, SORT_NUMERIC, // sort by col1 first,
    $col2_data, SORT_DESC, SORT_NUMERIC, // then by col2,
    $result // result won't contribute to the sort order but will be sorted
  );

http://3v4l.org/pWOLH
 [2015-03-30 08:56 UTC] to dot yashin at gmail dot com 
Thank you very much!
 
PHP Copyright © 2001-2026 The PHP Group
All rights reserved. 		Last updated: Wed Oct 07 14:00:01 2026 UTC