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Bug #66330 array_unique() sort problems
Submitted: 2013-12-20 14:05 UTC Modified: 2013-12-20 17:36 UTC
From: nomail at nomail dot de Assigned:
Status: Not a bug Package: Arrays related
PHP Version: Irrelevant OS: Windows
Private report: No CVE-ID: None
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 [2013-12-20 14:05 UTC] nomail at nomail dot de 
Description:
------------
The Sort_Flags are not realy working. Only SORT_NUMERIC and this on a unexpected way, it loose some values.

Your menu to select my phpversion has not my Version includet, so my Version is: 5.4.7



Test script:
---------------
$ar = array('rot','gelb','grün','rot','234fw343','blau','gold');

$ar1 = array_unique($ar);
$ar2 = array_unique($ar,SORT_REGULAR);
$ar3 = array_unique($ar,SORT_NUMERIC);
$ar4 = array_unique($ar,SORT_STRING);
$ar5 = array_unique($ar,SORT_LOCALE_STRING);



print_r($ar1);
print_r($ar2);
print_r($ar3);
print_r($ar4);
print_r($ar5);






Expected result:
----------------
### Output ####

##### NOT EXPECTED, this is the unexpected Output #####

Array
(
    [0] => rot
    [1] => gelb
    [2] => grün
    [4] => 234fw343
    [5] => blau
    [6] => gold
)
Array
(
    [0] => rot
    [1] => gelb
    [2] => grün
    [4] => 234fw343
    [5] => blau
    [6] => gold
)
Array
(
    [0] => rot
    [4] => 234fw343
)
Array
(
    [0] => rot
    [1] => gelb
    [2] => grün
    [4] => 234fw343
    [5] => blau
    [6] => gold
)
Array
(
    [0] => rot
    [1] => gelb
    [2] => grün
    [4] => 234fw343
    [5] => blau
    [6] => gold
)

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 [2013-12-20 17:36 UTC] bwoebi@php.net
-Status: Open +Status: Not a bug
 [2013-12-20 17:36 UTC] bwoebi@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

SORT_NUMERIC actually casts to integer and then compares; strings without numbers in it just are casted to 0 during an int cast.

If you cast the array, it results in array(0, 0, 0, 0, 234, 0, 0);
And when you apply array_unique to that array, you notice that that's correct behaviour.
 
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