XML reforming with DOM - php

Question

I am trying to reformat XML adding intermediate level node.
Here is what I have as input:
<channel>
<item>
<title>Advanced PHP Book</title>
</item>
<item>
<title>MySQL primer</title>
</item>
<item>
<title>C++ for beginners</title>
</item>
</channel>
I need it to be like that at the end (page node added between channel and item):
<channel>
<page>
<item>
<title>Advanced PHP Book</title>
</item>
<item>
<title>MySQL primer</title>
</item>
<item>
<title>C++ for beginners</title>
</item>
</page>
</channel>
Here is my testing code:
$sxe = simplexml_load_string($string);
$dom_sxe = dom_import_simplexml($sxe);
$dom = new DOMDocument('1.0');
$channel = $dom->appendChild($dom->createElement('channel'));
$page = $channel->appendChild($dom->createElement('page'));
$dom_sxe = $dom->importNode($dom_sxe, true);
$dom_sxe = $page->appendChild($dom_sxe);
$dom->formatOutput = true;
echo $dom->saveXML();
The problem I have is that channel element is doubled.
Please help.

Answer 1

I don't think this should be too hard: I think you're overcomplicating it by using the simplexml stuff.
$dom = new DOMDocument;
$dom->loadXML($string);
// create the <page> element
$page = $dom->createElement('page');
while ($dom->firstChild->firstChild) {
// move the items in <channel> to the <page> element
$page->appendChild($dom->firstChild->firstChild);
}
// insert the <page> element into <channel>
$dom->firstChild->appendChild($page);
$dom->saveXML();

Answer 2

$xml = '<channel> <item> <title>Advanced PHP Book</title> </item> <item> <title>MySQL primer</title> </item> <item> <title>C++ for beginners</title> </item> </channel>';
$dom = new DOMDocument;
$dom->loadXML($xml);
$page = $dom->createElement('page');
$items = $dom->getElementsByTagName('item');
while ($items->length) {
$page->appendChild($items->item(0));
}
$dom->getElementsByTagName('channel')->item(0)->appendChild($page);
echo $dom->saveXML();
Output
<?xml version="1.0"?>
<channel> <page><item> <title>Advanced PHP Book</title> </item><item> <title>MySQL primer</title> </item><item> <title>C++ for beginners</title> </item></page></channel>
See it.