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Request #24004 Bring back unchanging usort() values if equal
Submitted: 2003-06-03 17:45 UTC Modified: 2014-12-30 10:41 UTC
Avg. Score:3.8 ± 1.6
Reproduced:4 of 4 (100.0%)
Same Version:1 (25.0%)
Same OS:0 (0.0%)
From: tuxedobob at mac dot com Assigned:
Status: No Feedback Package: Arrays related
PHP Version: * OS: Any
Private report: No CVE-ID: None
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From: tuxedobob at mac dot com
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 [2003-06-03 17:45 UTC] tuxedobob at mac dot com
The script:


function comp($a, $b) {
  if (ceil($a) < ceil($b)) return (-1);
  if (ceil($a) > ceil($b)) return (1);
  return 0;

$arr = array('5.2', '5.4', '5.5', '5.9');

for ($x = 0; $x < 10; $x++) {
usort($arr, "comp");


(Any useful function can also be used for comp.)

When running the above script, usort() reverses the 
array upon each iteration. The documentation says as 
much might happen. However, it's much more useful if it 
doesn't. Perhaps there can be a new function so usort() 
can work the way it did in PHP<=4.0.6 for when the 
speed penalty is not an issue?


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 [2003-10-28 09:13 UTC] thochgreve at php-resource dot de
the manual states that there is no efficient solution to keep the original order if two elements are equal - I say there is:

usort creates an array with numeric indices anyway
just do that before the sorting
and if the comparison function returns 0, compare the indices
 [2014-04-16 18:28 UTC]
-Status: Open +Status: Feedback -Package: Feature/Change Request +Package: *General Issues -Operating System: Mac OS X 10.2.6 +Operating System: Any -PHP Version: 4.3.2 +PHP Version: *
 [2014-04-16 18:28 UTC]
As someone unfamiliar with the PHP 4 behavior, could you describe it again? I think I understand but am not quite sure.
 [2014-04-16 18:29 UTC]
-Package: *General Issues +Package: Arrays related
 [2014-12-30 10:41 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
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Last updated: Wed Jun 07 10:03:41 2023 UTC