Description:
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addChild() does not behave as expected(?) when used on a node that wasn't previously declared.

In the example below, we initialize an empty tree, to which we attempt to add a new node at "/child/grandchild" without previously adding "child" to the tree. addChild() seems to operate on a temporary SimpleXMLElement and the changes are never applied to the original object/tree.

I believe that this bug is also responsible of the segfault that happens if getName() is used on the temporary SimpleXMLElement. I was very tempted to file this bug as a reproducible crash, but decided to file it under SimpleXML in case it would help routing it to the maintainer faster.


Tested on:

PHP 5.2.4-dev (cli) (built: Jun 27 2007 20:04:30)
WinXP
libxml2 2.6.26
SimpleXML Revision: 1.151.2.22.2.29

PHP 5.2.2-pl1-gentoo (cli) (built: May 24 2007 00:26:35)
libxml 2.6.27
SimpleXML Revision: 1.151.2.22.2.26

Reproduce code:
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<?php

$xml = simplexml_load_string('<?xml version="1.0" encoding="utf-8" ?><root />');
$xml->child->addChild('grandchild');

echo $xml->asXML();

Expected result:
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I expect SimpleXML to create "child" if it does not exist, then add "grandchild" to that node. The output should be:

<?xml version="1.0" encoding="utf-8"?>
<root><child><grandchild/></child></root>

Actual result:
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Neither node is added to the tree. The output is:

<?xml version="1.0" encoding="utf-8"?>
<root/>