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List:       php-doc-bugs
Subject:    [DOC-BUGS] Doc #69059 [Fbk]: array_udiff logical bug
From:       laruence () php ! net
Date:       2015-02-16 3:38:53
Message-ID: 201502160338.t1G3crmq021774 () sgrv20 ! php ! net
[Download RAW message or body]

Edit report at https://bugs.php.net/bug.php?id=69059&edit=1

 ID:                 69059
 Updated by:         laruence@php.net
 Reported by:        geoleu11 at gmail dot com
 Summary:            array_udiff logical bug
 Status:             Feedback
 Type:               Documentation Problem
 Package:            *General Issues
 Operating System:   Ubuntu
 PHP Version:        Irrelevant
 Block user comment: N
 Private report:     N

 New Comment:

s ,bug,issue,


Previous Comments:
------------------------------------------------------------------------
[2015-02-16 03:38:15] laruence@php.net

compare function should return value greater than 0 if $a > $b, less than 0 if $b < \
$a.

thus, your codes should be:

<?php
$a1 = array('red');
$a2 = array('red', 'blue');

$diff = array_udiff($a1, $a2,
    function($a, $b) {
        if($a === $b) {
            return 0;
        }
        else {
            return $a > $b? 1 : -1;
        }
    });

var_dump($diff);


anyway, this bug doesn't exists in master because new sort algo impelemented.

thanks

------------------------------------------------------------------------
[2015-02-16 01:03:04] geoleu11 at gmail dot com

Description:
------------
---
From manual page: http://www.php.net/function.array-udiff
---

Since the information that can be selected for providing php version information, \
here is some info about the build : PHP Version 5.5.9-1ubuntu4.5 .

Also regarding the problem/bug source : array function, more specifically : \
array_udiff .

The output of the below script is : 

array (size=1)
  0 => string 'red' (length=3)  

Why does array_udiff return a common element from those arrays? Shouldn't it return \
the elements are present in the first array and not in the other arrays?

At least if you try internal array_diff, it does return the proper value from those 2 \
arrays below .

Test script:
---------------
$a1 = array('red');
$a2 = array('red', 'blue');

$diff = array_udiff($a1, $a2,
        function($a, $b) {
            if($a === $b) {
                return 0;
            }
            else {
                return -1;
            }
        });

var_dump($diff);

Expected result:
----------------
The expected result should be an empty array.

array (size=0)
  empty  

Actual result:
--------------
array (size=1)
  0 => string 'red' (length=3)


------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=69059&edit=1

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