ID: 14591
Updated by: hholzgra
Reported By: [EMAIL PROTECTED]
Status: Bogus
Bug Type: Arrays related
Operating System: Linux/Windows
PHP Version: 4.1.0
New Comment:
well, you can't say that no sorting is needed
in advance as uasort() does not know that
your comparison function is going to return
only zeros
i'm not that deep into qsort implementations
and, yes, i would expect qsort not to swap
elements that are considered equal, but only
for performance reasons ...
(sterling might be able to tell you how and
why zend_qsort does it internaly)
besides that it is totaly ok that you get
a different element order back as is still
a valid order for your sort criteria
good old "garbage in, garbage out" principle ;)
Previous Comments:
------------------------------------------------------------------------
[2001-12-19 04:31:47] [EMAIL PROTECTED]
Hm, I'd rather expect that an array keeps untouched if there is no need to sort it.
------------------------------------------------------------------------
[2001-12-18 19:24:23] [EMAIL PROTECTED]
and the problem is ...?
by returning all zeros you made perfectly clear
that you don't care about the order of elements
in your array ;)
------------------------------------------------------------------------
[2001-12-18 17:03:19] [EMAIL PROTECTED]
If you call uasort with a function that always returns 0 (elements equal) you get a
totally screwed array returned.
<?php
function mysort($a, $b)
{
return 0;
}
$a = array('h', 's', 'i', 'c', 'q', 'm');
var_dump($a);
uasort($a, 'mysort');
var_dump($a);
?>
returns:
array(6) {
[0]=>
string(1) "h"
[1]=>
string(1) "s"
[2]=>
string(1) "i"
[3]=>
string(1) "c"
[4]=>
string(1) "q"
[5]=>
string(1) "m"
}
array(6) {
[1]=>
string(1) "s"
[2]=>
string(1) "i"
[3]=>
string(1) "c"
[4]=>
string(1) "q"
[5]=>
string(1) "m"
[0]=>
string(1) "h"
}
------------------------------------------------------------------------
Edit this bug report at http://bugs.php.net/?id=14591&edit=1
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