Edit report at http://bugs.php.net/bug.php?id=54408&edit=1
ID: 54408
Comment by: blacknot at gmail dot com
Reported by: hitchiker at mail dot ru
Summary: Unexpected behaviour when using by-reference
iteration
Status: Bogus
Type: Bug
Package: Arrays related
Operating System: Win 7 x64, 2.6.18
PHP Version: 5.3.6
Block user comment: N
Private report: N
New Comment:
Why only last element of array have reference link? It`s realy
unexpected behaviour. We copy array $tags2 = $tags; but only last
element have reference.
Previous Comments:
------------------------------------------------------------------------
[2011-04-26 08:40:56] [email protected]
There is no expression-scope in PHP. If you create references in an
array in a foreach loop or in any other expression, those references
will still exist after the foreach. Follow the references and you will
see that the output makes sense. There is no bug here.
------------------------------------------------------------------------
[2011-04-26 08:33:18] blacknot at gmail dot com
I have similar problem:
$tags = array('iphone', 'apple', 'iPhone 4');
foreach ($tags as &$v) $v = trim($v);
$tags2 = $tags;
foreach ($tags2 as &$a) $a = '*';
print_r($tags);
Result:
Array
(
[0] => iphone
[1] => apple
[2] => *
)
------------------------------------------------------------------------
[2011-04-08 13:10:27] hitchiker at mail dot ru
I was sure that arrays are passed to functions by value, not by
reference. It looks like by-reference iteration changes array not only
isnide foreach statement, but array remains changed even after
iteration.
------------------------------------------------------------------------
[2011-03-28 14:35:20] hitchiker at mail dot ru
Description:
------------
I was sure that arrays are passed to functions by value, not by
reference. It looks like after by-reference iteration changes array not
only isnide foreach statement, but array remains changed even after
iteration.
Test script:
---------------
<?php
$a = array(1,2,3,4);
function myf($a,$k){
$a[$k] = 9;
}
foreach ($a as $k => &$v) {
myf($a, $k);
}
//myf($a, 3);
var_dump($a);
die();
Expected result:
----------------
array
0 => int 1
1 => int 2
2 => int 3
3 => int 4
Actual result:
--------------
array
0 => int 9
1 => int 9
2 => int 9
3 => &int 9
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=54408&edit=1
