#26673 [Fbk->NoF]: Nested object reference count not incremented when object copied?
| From: | sniper@php.net | Date: | Wed, 07 Jan 2004 01:52:44 +0000 |
| Subject: | #26673 [Fbk->NoF]: Nested object reference count not incremented when object copied? | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-52902@lists.php.net to get a copy of this message | ||
ID: 26673
Updated by: sniper@php.net
Reported By: samlw at aol dot com
-Status: Feedback
+Status: No Feedback
Bug Type: Scripting Engine problem
Operating System: *
PHP Version: 4.3.4
New Comment:
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
Previous Comments:
------------------------------------------------------------------------
[2004-01-01 20:56:21] sniper@php.net
Please provide a bit better script than this.
And what makes you think this isn't expected behaviour?
------------------------------------------------------------------------
[2003-12-19 18:17:10] samlw at aol dot com
Description:
------------
In certain cases, the reference
counting mechanism seems to become confused when
dealing with nested objects.
If class 'outer' has a member that is an object of
class 'inner', then a copy of an instance of outer
sometimes shares the original's reference to inner. As
a result, if a change is made to the inner member of
the copy, the original's inner is also changed. See the
attached code for a working example of this problem.
I have reproduced this problem in v 4.3.2 and 4.3.4
running on OS X.
Reproduce code:
---------------
class inner {
var $val1;
var $val2;
function inner ($val1, $val2) {
$this->set($val1, $val2);
}
function set ($val1, $val2) {
$this->val1 = $val1;
$this->val2 = $val2;
}
}
class outer {
var $val0;
var $inner;
function outer ($val0, $val1, $val2) {
$this->val0 = $val0;
$this->inner = new inner($val1, $val2);
}
function set ($val0, $val1, $val2) {
$this->val0 = $val0;
$this->inner->set($val1, $val2);
}
}
// construct and dump an object with values [0, 1, 2]
$myOuter = new outer(0, 1, 2);
var_dump($myOuter);
echo '<br />--------<br />';
// change values to [3, 4, 5]
$myOuter->set(3, 4, 5);
var_dump($myOuter);
echo '<br />--------<br />';
// make a COPY and change values to [6, 7, 8]
$myOuterCopy = $myOuter;
$myOuterCopy->set(6, 7, 8);
var_dump($myOuterCopy);
echo '<br />--------<br />';
// dump original - should still be [3, 4, 5], but it is [3, 7, 8]!!!
// the inner object is not getting copied on modification!!!
var_dump($myOuter);
echo '<br />--------<br />';
Expected result:
----------------
The final var_dump should produce:
object(outer)(2) { ["val0"]=> int(3) ["inner"]=>
&object(inner)(2) { ["val1"]=> int(4)
["val2"]=> int(5) } }
Actual result:
--------------
The final var_dump produces:
object(outer)(2) { ["val0"]=> int(3) ["inner"]=>
&object(inner)(2) { ["val1"]=> int(7)
["val2"]=> int(8) } }
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=26673&edit=1