Bug #67182 [Opn->Nab]: asort() broken with boolean values.
Edit report at https://bugs.php.net/bug.php?id=67182&edit=1
ID: 67182
Updated by: requinix@php.net
Reported by: php at liambowers dot co dot uk
Summary: asort() broken with boolean values.
-Status: Open
+Status: Not a bug
Type: Bug
Package: Arrays related
Operating System: Windows 7
PHP Version: 5.4.28
Block user comment: N
Private report: N
New Comment:
Sorting arrays containing mixed types can lead to unexpected results because the default comparison
function may return contradictory decisions. Here, "a" == true and true == "b",
however "a" < "b".
Use usort() with your own comparison function that uses consistent logic.
Previous Comments:
------------------------------------------------------------------------
[2014-05-02 15:55:51] php at liambowers dot co dot uk
Description:
------------
When using asort() with a boolean true value in any other position than the first item in an array,
it breaks.
Tried with versions 5.4.28 (Win7), 5.4.27 (Win7), 5.4.12 (Win7) and 5.4.10 (OSX)
Test script:
---------------
$tests = array(
'test_with_boolean_broken_1' => array('a', true, 'b',
'c'),
'test_with_boolean_broken_2' => array('a', 'b', 'c',
true),
'test_with_boolean_working_1' => array(true, 'a', 'b',
'c'),
'test_without_boolean_working' => array('a', 1, 'b',
'c')
);
foreach($tests as $test_name => $test_data)
{
echo '<h1>' . $test_name . '</h1>';
echo '<li>data 1 (unsorted):<pre>' . print_r($test_data, true) .
'</pre>';
asort($test_data);
echo '<li>data 2 (sorted):<pre>' . print_r($test_data, true) .
'</pre>';
asort($test_data);
echo '<li>data 3 (resorted 1):<pre>' . print_r($test_data, true) .
'</pre>';
asort($test_data);
echo '<li>data 4 (resorted 2):<pre>' . print_r($test_data, true) .
'</pre>';
}
Expected result:
----------------
When using:
Array
(
[0] => a
[1] => 1
[2] => b
[3] => c
)
Result should be:
Array
(
[0] => a
[2] => b
[3] => c
[1] => 1
)
Actual result:
--------------
After asort() #1:
Array
(
[2] => b
[3] => c
[1] => 1
[0] => a
)
After asort() #2:
Array
(
[0] => a
[2] => b
[3] => c
[1] => 1
)
After asort() #3:
Array
(
[0] => a
[1] => 1
[2] => b
[3] => c
)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=67182&edit=1
Thread (2 messages)