#49347 [Bgs]: iterating through an array plus creating a refererence to the current element
| From: | zoli at lippai dot net | Date: | Wed, 26 Aug 2009 13:01:36 +0000 |
| Subject: | #49347 [Bgs]: iterating through an array plus creating a refererence to the current element | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-141551@lists.php.net to get a copy of this message | ||
ID: 49347
User updated by: zoli at lippai dot net
Reported By: zoli at lippai dot net
Status: Bogus
Bug Type: Arrays related
Operating System: OS X 10.5.8
PHP Version: 5.3.0
New Comment:
Here is an other example:
$list = array(
array('id' => 1),
array('id' => 2)
);
for($i = 0; $i < count($list); $i++) {
$item = &$list[$i];
$item['someValue'] = 'x';
}
var_dump($list);
after that the value of $list is:
array(2) {
[0]=>
array(2) {
["id"]=>
int(1)
["someValue"]=>
string(1) "x"
}
[1]=>
&array(2) {
["id"]=>
int(2)
["someValue"]=>
string(1) "x"
}
The second element has a & in front of it, I think this is causing the
problem.
Previous Comments:
------------------------------------------------------------------------
[2009-08-24 20:36:35] jani@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
------------------------------------------------------------------------
[2009-08-24 18:14:50] sjoerd@php.net
The variable $list has the expected value after the for loop. You can
show this by doing print_r($list). However, the $item in the first for
loop seems to interfere with the $item in the second foreach loop.
------------------------------------------------------------------------
[2009-08-24 15:44:05] zoli at lippai dot net
Description:
------------
When I iterate through an array with "for" and create a reference to
the current element inside the for, then the last element of the array
will be a reference to the previous element.
If I unset the reference variable at the end of every cycle, then it
works fine.
Reproduce code:
---------------
<?php
$list = array(
array('id' => 1),
array('id' => 2)
);
for($i = 0; $i < count($list); $i++) {
$item = &$list[$i];
$item['someValue'] = 'x';
}
foreach($list as $item)
{
var_dump($item);
}
Expected result:
----------------
array(2) {
["id"]=>
int(1)
["someValue"]=>
string(1) "x"
}
array(2) {
["id"]=>
int(2)
["someValue"]=>
string(1) "x"
}
Actual result:
--------------
array(2) {
["id"]=>
int(1)
["someValue"]=>
string(1) "x"
}
array(2) {
["id"]=>
int(1)
["someValue"]=>
string(1) "x"
}
(Please note the second elements id, which is 1 instead of 2)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=49347&edit=1