Bug #51462 [Wfx]: Extending DOM classes work only if copy of object present

Edit report at http://bugs.php.net/bug.php?id=51462&edit=1

 ID:               51462
 User updated by:  pahan at hubbitus dot info
 Reported by:      pahan at hubbitus dot info
 Summary:          Extending DOM classes work only if copy of object
                   present
 Status:           Wont fix
 Type:             Bug
-Package:          DOM XML related
+Package:          *General Issues
 Operating System: Linux
 PHP Version:      5.3.2

 New Comment:

>The tree does not maintain object state.
Who does it?

> If you are only looking for your own 
> classtypes to be returned by the DOM methods/properties then use 
> registerNodeClass() to register the types.
I do not speak about DOMDocument createElement method return my class
element. I 
only report what element class lost after add it into tree! And in any
case BUG 
what it behaves differently dependent to outer links present:
1) If it uses reference to provided object, why it unexpectedly change
type of 
it?
2) If it copy object, why it depend on links??

In any case, when method relied on foreign variables it is not
determinated! And 
it should be fixed in some way...


Previous Comments:
------------------------------------------------------------------------
[2010-04-02 13:19:32] [email protected]

The tree does not maintain object state. If you are only looking for
your own 
classtypes to be returned by the DOM methods/properties then use 
registerNodeClass() to register the types.

------------------------------------------------------------------------
[2010-04-02 12:51:04] pahan at hubbitus dot info

Description:
------------
Extending some DOM classes (f.e. DOMDOcument, DOMElement I think others,
but not 
tested) work. But when such elemenmt appended to the document,
additional 
information lost. Meantime, when copy of object saved alsewere, all work
as 
expected.

First mention of this bug and initial workaround in comment 
http://php.net/manual/tr/book.dom.php#80613 by ryoroxdahouse at hotmail
dot com.

I make automattical workaround like ( 
http://hinikato.blogspot.com/2009/10/domelement.html?
showComment=1270202266600#c284093039037001302 ):
class MyElement extends DOMElement
{
public function __construct($name, $value = null, $uri = null) {
parent::__construct($name, $value, $uri);
$GLOBALS['PHP_HACK_DOM_ELEMENT'][spl_object_hash($this)] = $this;
//Note, 
reference is not enough :(
}

public function __destruct() {
unset($GLOBALS['PHP_HACK_DOM_ELEMENT'][spl_object_hash($this)]);
}
}

But as we need object copy, not just reference it requires double of
memmory!

Test script:
---------------
<?
class MyElement extends DOMElement{}
$doc = new DOMDocument();
$doc->appendChild(new MyElement('test'));
var_dump($doc->documentElement);
?>

Expected result:
----------------
object(MyElement)#4 (0) { } 

Actual result:
--------------
object(DOMElement)#4 (0) { }


------------------------------------------------------------------------



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Edit this bug report at http://bugs.php.net/bug.php?id=51462&edit=1