#47370 [NEW]: array_unique has backward compatibility problem, and SORT_REGULAR is confusing

From: Date: Thu, 12 Feb 2009 16:22:38 +0000
Subject: #47370 [NEW]: array_unique has backward compatibility problem, and SORT_REGULAR is confusing
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-133767@lists.php.net to get a copy of this message 
From:             for-bugs at hnw dot jp
Operating system: any
PHP version:      5.2.9RC1
PHP Bug Type:     Arrays related
Bug description:  array_unique has backward compatibility problem, and SORT_REGULAR is confusing

Description:
------------
In PHP5.2.9RC1, array_unique() returns different result because of element
ordering in array. Reproduce code shows this difference.

It is because SORT_REGULAR never cast array elements and compares them
with ==. I think it's better for SORT_REGULAR to compare elements by using
=== instead of ==.

PHP 5.2.9RC1's array_unique() also has backward compatibility ploblem.
Considering backward compatibility, default sort_flag should be
SORT_STRING.

Reproduce code:
---------------
<?php
var_dump(arary_unique(array(0,"","0"))));
var_dump(arary_unique(array("","0",0))));

Expected result:
----------------
I don't know, but 2 results should be same.

Actual result:
--------------
array(1) {
  [0]=>
  int(0)
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  string(1) "0"
}

-- 
Edit bug report at http://bugs.php.net/?id=47370&edit=1
-- 
Try a CVS snapshot (PHP 5.2):        http://bugs.php.net/fix.php?id=47370&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):        http://bugs.php.net/fix.php?id=47370&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):        http://bugs.php.net/fix.php?id=47370&r=trysnapshot60
Fixed in CVS:                        http://bugs.php.net/fix.php?id=47370&r=fixedcvs
Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=47370&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=47370&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=47370&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=47370&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=47370&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=47370&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=47370&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=47370&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=47370&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=47370&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=47370&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=47370&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=47370&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=47370&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=47370&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=47370&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=47370&r=mysqlcfg

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