Req #71054 [Nab]: arsort() function backward incompatible.
Edit report at https://bugs.php.net/bug.php?id=71054&edit=1
ID: 71054
User updated by: spongi1019 at naver dot com
Reported by: spongi1019 at naver dot com
Summary: arsort() function backward incompatible.
Status: Not a bug
Type: Feature/Change Request
Package: Arrays related
Operating System: CentOS 5.9
PHP Version: 7.0.0
Block user comment: N
Private report: N
New Comment:
Thank you so much for your reply
Previous Comments:
------------------------------------------------------------------------
[2015-12-08 14:46:07] rasmus@php.net
The manual page that is relevant here is:
http://php.net/manual/en/array.sorting.php
Specifically the line that says:
If any of these sort functions evaluates two members as equal then the order is undefined (the
sorting is not stable).
So that test of yours relies on undefined behaviour.
------------------------------------------------------------------------
[2015-12-08 10:31:10] laruence@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
we are using stable sorting algo for elements less 16(actually we will split elements into 16 by
using un-stable sorting algo)
------------------------------------------------------------------------
[2015-12-08 08:37:07] spongi1019 at naver dot com
Description:
------------
All the same, the value of element
Non-compatible features have been found in the function.
arsort()
PHP 5.2 ~ 5.6 result
----
array(4) {
["d"]=>
int(1)
["c"]=>
int(1)
["z"]=>
int(1)
["a"]=>
int(1)
}
PHP 7.0 result
----
array(4) {
["a"]=>
int(1)
["z"]=>
int(1)
["c"]=>
int(1)
["d"]=>
int(1)
}
Test script:
---------------
<?php
$arr = array(
'a' => 1,
'z' => 1,
'c' => 1,
'd' => 1
);
arsort($arr);
var_dump($arr);
Expected result:
----------------
array(4) {
["d"]=>
int(1)
["c"]=>
int(1)
["z"]=>
int(1)
["a"]=>
int(1)
}
Actual result:
--------------
array(4) {
["a"]=>
int(1)
["z"]=>
int(1)
["c"]=>
int(1)
["d"]=>
int(1)
}
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=71054&edit=1
Thread (4 messages)