php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #65090 array_multisort() with SORT_NATURAL | SORT_FLAG_CASE results in incorrect order
Submitted: 2013-06-21 18:50 UTC Modified: 2013-06-22 09:53 UTC
From: rgrove at smugmug dot com Assigned:
Status: Not a bug Package: Arrays related
PHP Version: 5.4.16 OS: Linux 2.6.18-194.3.1.el5
Private report: No CVE-ID: None
 [2013-06-21 18:50 UTC] rgrove at smugmug dot com
Description:
------------
When the SORT_NATURAL | SORT_FLAG_CASE flags are passed to array_multisort(), it 
sorts strings beginning with the letter "a" above strings beginning with "_", even 
though "_" has a lower ordinal value.

natsort() places "_" before "a" as I would expect, and array_multisort() places 
"_" before "a" when given only the SORT_NATURAL flag, without ORing it with 
SORT_FLAG_CASE.

See the test script for details.

Test script:
---------------
<?php
$keys   = ["_", "a"];
$values = ["first", "second"];

// Results in incorrect order.
array_multisort($keys, SORT_NATURAL | SORT_FLAG_CASE, $values, SORT_ASC);
print_r($keys);
print_r($values);

// Results in correct order.
natsort($keys);
print_r($keys);

// Results in correct order.
array_multisort($keys, SORT_NATURAL, $values, SORT_ASC);
print_r($keys);
?>

Expected result:
----------------
I expect "_" to be sorted before "a", just as natsort() does.

Actual result:
--------------
"a" is sorted before "_".

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2013-06-22 09:53 UTC] ab@php.net
-Status: Open +Status: Not a bug
 [2013-06-22 09:53 UTC] ab@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

That flag combination is exactly what natcasesort() is supposed to do. That means 
the behavior is totally correct. Unless you don't need case folding, just remove 
SORT_FLAG_CASE.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Mon Jun 17 12:01:31 2024 UTC