Ben Roberts wrote:
So really when you perform:
$dom = dom_import_simplexml($xml);
the $dom object is really created by taking a reference to the $xml
object rather than copying it? i.e. (I know this isn't real code)
$dom = dom_import_simplexml(& $xml);
Not exactly, but the idea is along those lines.
What is happening is that $dom (DOMElement in this case) now points to
the same libxml2 structure as does $xml (SimpleXMLElement).
So now when you modify the structure of the document with one, it is
reflected by the other because they are in the same document. This also
means that it is possible that objects can become invalid by changes
made in the other extension.
$sxe = new
SimpleXMLElement("<root><child><inner>text</inner></child></root>");
$sxechild = $sxe->child->inner[0];
$dom = dom_import_simplexml($sxe);
$dom->removeChild($dom->firstChild);
var_dump($sxechild);
PHP Warning: var_dump(): Node no longer exists in
/home/rrichards/temp.php on line 8
object(SimpleXMLElement)#3 (0) {
}
This shows that $sxechild is still an SimpleXMLElement, but warnings are
issues that the node it refers to in the document no longer exists.
Although I doubt someone use the code above, it is the smallest piece of
code I could write to demonstrate the possibility.
Rob
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