Edit report at https://bugs.php.net/bug.php?id=50688&edit=1
ID: 50688
Comment by: albert at mediatribe dot net
Reported by: jcampbell at remindermedia dot com
Summary: Using exceptions inside usort() callback function
causes a warning
Status: Assigned
Type: Bug
Package: Arrays related
Operating System: Fedora Core 12
PHP Version: 5.*, 6
Assigned To: stas
Block user comment: N
Private report: N
New Comment:
A notice within the compare function will also trigger this notice. For example:
function test($a, $b) {
return strnatcmp($a['name'], $b['name']);
}
$e = array(
array(
'not-name' => 'a',
),
array(
'name' => '',
),
);
uasort($e, 'test');
(this is tested on PHP 5.3)
Previous Comments:
------------------------------------------------------------------------
[2016-01-03 14:46:18] white06tiger+PHPbug at gmail dot com
Related To: Bug #71238
------------------------------------------------------------------------
[2015-07-18 14:17:52] nikic@php.net
This has been fixed in PHP 7.
------------------------------------------------------------------------
[2013-08-19 19:04:24] m at rtin dot so
Sorry the use () isn't relevant, I forgot to remove it when simplifying my test
case
------------------------------------------------------------------------
[2013-08-19 18:23:17] m at rtin dot so
I ran into a similar issue, i'm sure it'll require the same patch as it's the
backtrace causing the problem but worth noting it doesn't require an exception to
trigger this, just a backtrace.
$ cat usort.php
<?php
set_error_handler(function($errno, $errstr) {
$bt = debug_backtrace();
var_dump($errstr);
});
$arr = [1, 2];
usort($arr, function($a, $b) use ($arr) {
trigger_error('test');
return $a > $b;
});
$ php usort.php
string(4) "test"
string(59) "usort(): Array was modified by the user comparison function"
------------------------------------------------------------------------
[2013-07-09 07:21:19] jakub dot lopuszanski at nasza-klasa dot pl
I'd like to add, that you do not have to throw an exception to get this warning.
Mere creating it, also triggers the warning, as in:
<?php
function comp($a,$b){
@new Exception("dupa");
}
$a =array(1,2,3);
usort($a, 'comp');
var_dump($a);
?>
PHP Warning: usort(): Array was modified by the user comparison function in
/home/jlopuszanski/test.php on line 6
------------------------------------------------------------------------
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