Need to copy specific XML node from one doc to another - php

Question

I have two XML files (that have a number of common nodes) that look a bit like these:
DESTINATION FILE: ('destination.xml')
<items>
<item>
<title>Item A</title>
<description>This is the description for Item A</description>
<id>1001</id>
</item>
<item>
<title>Item B</title>
<description>This is the description for Item B</description>
<id>1002</id>
</item>
<item>
<title>Item D</title>
<description>This is the description for Item D</description>
<id>1004</id>
</item>
and
SOURCE FILE: ('source.xml')
<items>
<item>
<title>Item A</title>
<description>This is the description for Item A</description>
<id>1001</id>
</item>
<item>
<title>Item C</title>
<description>This is the description for Item C</description>
<id>1003</id>
</item>
<item>
<title>Item B</title>
<description>This is the description for Item B</description>
<id>1002</id>
</item>
I need to grab the node from SOURCE with the 'id' matching '1003' (in this example) and import it into the DESTINATION. I'm looking for insight in using importNode (or a simpleXML option) and also the xpath in only getting only the node I need.

Answer 1

Just do that and it should work :
<?php
header('Content-type: application/xml'); //Just to test in the browser directly and have a good format
$docSource = new DOMDocument();
$docSource->loadXML(file_get_contents('source.xml'));
$docDest = new DOMDocument();
$docDest->loadXML(file_get_contents('destination.xml'));
$xpath = new DOMXPath($docSource);
$result = $xpath->query('//item[id=1003]')->item(0); //Get directly the node you want
$result = $docDest->importNode($result, true); //Copy the node to the other document
$items = $docDest->getElementsByTagName('items')->item(0);
$items->appendChild($result); //Add the copied node to the destination document
echo $docDest->saveXML();

Answer 2

To get the correct node, I think your XPath should look like this:
$xpath->query('/items/item/id[.="1003"]/..')
To import it to the other document, you'll need to create the document and call importNode with the second parameter set to true:
$newDom = new DOMDocument;
$newDom->load('destination.xml');
$newNode = $newDom->importNode($el, true);
$newDom->firstChild->appendChild($newNode);
file_put_contents('destination.xml', $newDom->saveXML());