#27268 [Com]: Bad references accentuated by clone
ID: 27268
Comment by: splab at bach-mortensen dot dk
Reported By: lingwitt at bellsouth dot net
Status: Open
Bug Type: Zend Engine 2 problem
Operating System: *
PHP Version: 5CVS-2004-02-18
New Comment:
Clone doesnt seem to act as expected on domdocument - we want a copy of
the entire document but get what seems to be root node - and segfault
if we try to work on it:
$dom = new domdocument();
$dom->load("somexml.xml");
print $dom->getElementsByTagName("body")->length . "\n";//1
$dom2 = clone $dom;
$dom2->getElementsByTagName("body")->length; //Segfault
somexml.xml:
<body>
<paragraf>
test test test
</paragraf>
</body>
Previous Comments:
------------------------------------------------------------------------
[2004-02-15 23:47:13] lingwitt at bellsouth dot net
In fact, the reference doesn't need to be made in a
method:
class A
{
var $a = array();
public function &getA()
{
return $this->a;
}
}
$A = new A;
$A->a = array(1);
$array = $A->getA();
$clone = clone $A;
$clone->a = array();
print_r($A);
------------------------------------------------------------------------
[2004-02-15 21:06:03] lingwitt at bellsouth dot net
Description:
------------
When an object's method calls upon another one of its
methods such that the second method returns a reference
that is stored in the the first method as a local
variable, then the reference persists in some way so as
to make cloning problematic.
As a result, a modification to the referenced variable
in the clone cuases a modification to the same variable
in original.
Reproduce code:
---------------
class A
{
var $a = array();
public function makeAReference()
{
$array = $this->getA();
}
public function &getA()
{
return $this->a;
}
}
$A = new A;
$A->a = array(1);
$A->makeAReference();
$clone = clone $A;
$clone->a = array();
print_r($A);
Expected result:
----------------
This is gotten when $A->makeAReference() is removed.
A Object
(
[a] => Array
(
[0] => 1
)
)
Actual result:
--------------
Obviously the modification made it back to the original.
A Object
(
[a] => Array
(
)
)
------------------------------------------------------------------------
--
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