Edit report at https://bugs.php.net/bug.php?id=65208&edit=1
ID: 65208
Comment by: enno dot woortmann at web dot de
Reported by: of dot olivier dot favre at gmail dot com
Summary: array_unique SORT_STRICT flag for predictable
results with type-mixed values
Status: Open
Type: Feature/Change Request
Package: Arrays related
Operating System: Debian wheezy
PHP Version: 5.4.4
Block user comment: N
Private report: N
New Comment:
Seems like the result of array_unique changed with the 8.0.0beta1 - rc3.
Test script
-----------
var_export(array_unique(['1', 'a', 1, 9, null], SORT_REGULAR));
Output with 8.0.0beta1 - rc3
array (
0 => '1',
1 => 'a',
3 => 9,
4 => NULL,
)
Output of all 7.x versions (and the alpha versions, except alpha2 which changed the order of the
elements)
array (
0 => '1',
1 => 'a',
2 => 1,
3 => 9,
4 => NULL,
)
compare: https://3v4l.org/WTZe6
Previous Comments:
------------------------------------------------------------------------
[2020-08-13 09:34:45] nikic@php.net
Related To: Bug #79890
------------------------------------------------------------------------
[2013-07-05 10:04:23] of dot olivier dot favre at gmail dot com
Better patch summary.
------------------------------------------------------------------------
[2013-07-05 10:02:18] of dot olivier dot favre at gmail dot com
Description:
------------
The doc claims âSORT_REGULAR - compare items normally (don't change types)â
Hence (int)1 and (string)"1" should both be considered non duplicates.
Current results with SORT_REGULAR are too unpredictable for this function/flag to
be useful.
See #47370:
âI think it's better for SORT_REGULAR to compare elements by using === instead of
==.â
Request:
Add a SORT_STRICT flag using strict === comparison between elements. (prevents
from changing SORT_REGULAR behavior).
Tested on:
Debian GNU/Linux 7.1 (wheezy)
$ php --version
PHP 5.4.4-10 (cli) (built: Nov 24 2012 11:21:26)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
with Xdebug v2.2.0, Copyright (c) 2002-2012, by Derick Rethans
Test script:
---------------
var_export(array_unique(array( 1, 2, 2, 3, "1"), SORT_REGULAR)); // "1" is
suppressed!
echo "\n";
var_export(array_unique(array( 1, 2, 2, 3, "1", "c"), SORT_REGULAR)); //
"1" and "c" are kept (as it should be)
echo "\n";
// Weirder, with the same values in an other order
var_export(array_unique(array( 1, 2, 2, 3, "1", "c"), SORT_REGULAR)); //
"1" and "c" are kept (as it should be)
echo "\n";
var_export(array_unique(array( "c", 1, 2, 2, 3, "1"), SORT_REGULAR)); //
"1" is suppressed!
echo "\n";
Expected result:
----------------
array (
0 => 1,
1 => 2,
3 => 3,
4 => '1',
)
array (
0 => 1,
1 => 2,
3 => 3,
4 => '1',
5 => 'c',
)
array (
0 => 1,
1 => 2,
3 => 3,
4 => '1',
5 => 'c',
)
array (
0 => 'c',
1 => 1,
2 => 2,
4 => 3,
5 => '1',
)
Actual result:
--------------
array (
0 => 1,
1 => 2,
3 => 3,
)
array (
0 => 1,
1 => 2,
3 => 3,
4 => '1',
5 => 'c',
)
array (
0 => 1,
1 => 2,
3 => 3,
4 => '1',
5 => 'c',
)
array (
0 => 'c',
1 => 1,
2 => 2,
4 => 3,
)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=65208&edit=1