Bug #81156 [Com]: unset() on ArrayObject inside foreach skips next index
Edit report at https://bugs.php.net/bug.php?id=81156&edit=1
ID: 81156
Comment by: Arthur988Davis at gmail dot com
Reported by: php at yopmail dot com
Summary: unset() on ArrayObject inside foreach skips next
index
Status: Open
Type: Bug
Package: SPL related
PHP Version: 7.3.28
Block user comment: N
Private report: N
New Comment:
Hello, Try this
Normally, foreach operates on a copy of your array so any changes you make, are made to that copy
and don't affect the actual array.
So you need to unset the values via $images[$key];
The reference on &$image prevents the loop from creating a copy of the array which would waste
memory.
(https://www.alaskasworld.kim/)github.com
Previous Comments:
------------------------------------------------------------------------
[2021-06-17 14:47:51] php at yopmail dot com
Description:
------------
While looping over an ArrayObject with a foreach, if we unset an offset, then the next one gets
skipped.
It works fine with a plain array.
Note: This looks similar to Bug #55157 and Bug #70246 but they were/are for ArrayIterator.
This may also be a "Documentation Problem", but that's at least surprising (a bit
like Bug #80945, now fixed -- thanks nikic!)
More complete example: https://3v4l.org/sM8A5 (note: there was
a Notice before PHP 7)
Workaround: Do not foreach over $ao directly but over $ao->getArrayCopy() or (array)$ao
Test script:
---------------
<?php
$ao = new ArrayObject([true, false, false, true]);
foreach ($ao as $key => $value) {
echo $key, "\n";
if (!$value) {
unset($ao[$key]); // or $ao->offsetUnset($key);
}
}
echo json_encode($ao), "\n";
Expected result:
----------------
0
1
2
3
{"0":true,"3":true}
Actual result:
--------------
0
1
3
{"0":true,"2":false,"3":true}
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=81156&edit=1
Thread (2 messages)