From:
Operating system: All
PHP version: 5.2.13
Package: Arrays related
Bug Type: Feature/Change Request
Bug description:consecutives sorting with usort and uasort
Description:
------------
on an array with collection of the same object
the object have 2 property a et b
Exemple:
[
object:{a=3, b=2}
object:{a=0, b=2}
object:{a=2, b=3}
object:{a=1, b=2}
If you make a first sort with the good fonction and usort on property a,
you obtain
[
object:{a=0, b=2}
object:{a=1, b=2}
object:{a=2, b=3}
object:{a=3, b=2}
]
The result is that you intend
Now if you make a second sort with another function and usort on property
b, you obtain
[
object:{a=3, b=2}
object:{a=1, b=2}
object:{a=0, b=2}
object:{a=2, b=3}
]
The result is not you can wait. I think that's because the read of the
array is make in inverse way.
A possible solution is to mark the placed elements. And not move elements
not tested before or after them the marked element.
Best Regards
Test script:
---------------
<?php
function compa($a, $b){ if($a['a']>$b['a']) return 1; else return
($a['a']<$b['a'])?-1:0; }
function compb($a, $b){ if($a['b']>$b['b']) return 1; else return
($a['b']<$b['b'])?-1:0; }
$a = array(array('a'=>1, 'b'=>2), array('a'=>2, 'b'=>3), array('a'=>3,
'b'=>2), array('a'=>0, 'b'=>2), array('a'=>4, 'b'=>2));
usort($a, 'compa');
print_r($a);
usort($a, 'compb');
print_r($a);
?>
Expected result:
----------------
Array
(
[0] => Array
(
[a] => 0
[b] => 2
)
[1] => Array
(
[a] => 1
[b] => 2
)
[2] => Array
(
[a] => 3
[b] => 2
)
[3] => Array
(
[a] => 2
[b] => 3
)
)
Actual result:
--------------
Array
(
[0] => Array
(
[a] => 3
[b] => 2
)
[1] => Array
(
[a] => 1
[b] => 2
)
[2] => Array
(
[a] => 0
[b] => 2
)
[3] => Array
(
[a] => 2
[b] => 3
)
)
--
Edit bug report at http://bugs.php.net/bug.php?id=51229&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=51229&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=51229&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=51229&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=51229&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=51229&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=51229&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=51229&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=51229&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=51229&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=51229&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=51229&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=51229&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=51229&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=51229&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51229&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=51229&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=51229&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=51229&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=51229&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=51229&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=51229&r=mysqlcfg
