PHP Move DOMDocument nodes to a new parent - php

Question

I have a xml file from a client which is not compleet what i want, so i have to rewrite it.
This is what i have:
<artikel>
<kop>
<titel>Artikel 2.</titel>
</kop>
<lid>
<lidnr>1</lidnr>
<al>content</al>
</lid>
<lid>
<lidnr>2</lidnr>
<al>content</al>
</lid>
</artikel>
and this is what i need:
<artikel>
<kop>
<titel>Artikel 2.</titel>
</kop>
<leden>
<lid>
<lidnr>1</lidnr>
<al>content</al>
</lid>
<lid>
<lidnr>2</lidnr>
<al>content</al>
</lid>
</leden>
</artikel>
I do not know xml very well, so i have a problem. I think this needed to be done:
1) create a new_parent_node "leden"
2) per "lid": add "lid" to "leden" node and remove from "artikel" node
3) add new node "leden" after "kop" node
This is what i have so far:
$dom->load($publicatieurl_xml);
$artikels = $dom->getElementsByTagName('artikel');
foreach ($artikels as $key => $artikel) {
$lidNodes = $artikel->getElementsByTagName('lid');
if ( $lidNodes->length !== 0 ) {
$new_parent_node = $dom->createElement('leden');
foreach ( $lidNodes as $key => $lid ) {
$new_parent_node->appendChild( $lid );
}
echo ($new_parent_node->ownerDocument->saveXML($new_parent_node));
}
}
Where this does not work: $new_parent_node->appendChild( $lid );
because it is an object.
So what i need to know is:
1) how can i add the already existing XML-element "$lid" to my "leden" node
2) how do i remove the "lid" nodes? Yet another foreach loop? Because i can not remove it in the one where i append the $lid, because that ruins the foreach elements...

Answer 1

I would use XSLT for that. First create the stylesheet document:
translate.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<artikel>
<xsl:copy-of select="/artikel/kop" />
<leden>
<xsl:copy-of select="/artikel/lid" />
</leden>
</artikel>
</xsl:template>
</xsl:stylesheet>
Now comes the PHP code:
// Load input from customer. (Can be an http:// url if desired)
$input = new DOMDocument();
$input->load('input.xml');
// Load the stylesheet document
$xsl = new DOMDocument();
$xsl->load('translate.xsl');
$xsltproc = new XSLTProcessor();
$xsltproc->importStylesheet($xsl);
// transformToXML() returns the translated xml as a string
echo $xsltproc->transformToXML($input);
// ... or transformToDoc() can be used if you need to
// further process the translated xml.
$newdoc = $xsltproc->transformToDoc($input);
Btw, if you don't want to store the xsl in a separate file, you use DOMDocument::loadXML() to load it:
$xsl = new DOMDocument();
$xsl->loadXML(<<<EOF
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<artikel>
<xsl:copy-of select="/artikel/kop" />
<leden>
<xsl:copy-of select="/artikel/lid" />
</leden>
</artikel>
</xsl:template>
</xsl:stylesheet>
EOF
);