#48460 [Opn]: Referencing an object property causes behaviour change after clone
| From: | ben at last dot fm | Date: | Wed, 03 Jun 2009 13:34:44 +0000 |
| Subject: | #48460 [Opn]: Referencing an object property causes behaviour change after clone | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-138007@lists.php.net to get a copy of this message | ||
ID: 48460
User updated by: ben at last dot fm
Reported By: ben at last dot fm
Status: Open
-Bug Type: Arrays related
+Bug Type: Variables related
Operating System: Linux
PHP Version: 5.2.9
New Comment:
Sorry, put this in the wrong category.
Previous Comments:
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[2009-06-03 13:32:35] ben at last dot fm
More minimal test case:
<?php
class A { var $p; }
$a = new A;
$a->list = 1;
$b = clone $a;
$link =& $a->p;
unset($link);
$c = clone $a;
$link =& $a->p;
$d = clone $a;
unset($link);
$e = clone $a;
$b->p = 2;
$c->p = 3;
$d->p = 4;
$e->p = 5;
echo "$a->p\n$b->p\n$c->p\n$d->p\n$e->p\n";
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[2009-06-03 13:29:02] ben at last dot fm
Description:
------------
If you create a reference to a property of an object, then clone
the object, the reference will become bi-directional and the property
will no longer behave like a property.
This does not happen if you create, then destroy, the reference BEFORE
cloning.
This persists even if you unset the reference AFTER cloning.
Reproduce code:
---------------
<?php
class A { var $list; }
$a = new A;
$a->list = array( 1, 1, 1, 1, 1 );
$b = clone $a;
$link =& $a->list;
unset($link);
$c = clone $a;
$link =& $a->list;
$d = clone $a;
unset($link);
$e = clone $a;
$b->list = array(2,2,2,2,2);
$c->list = array(3,3,3,3,3);
$d->list = array(4,4,4,4,4);
$e->list = array(5,5,5,5,5);
echo "$a\n$b\n$c\n$d\n$e\n";
Expected result:
----------------
{1}
{2}
{3}
{4}
{5}
Actual result:
--------------
{5}
{2}
{3}
{5}
{5}
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=48460&edit=1