DOMDocument saving XML CDATA

Question

I have an xml file with elements in the form of

<TEST id="messageId"><![CDATA[Text I want to manipulate]]></TEST>

I can access the text within the CDATA with the code below

$dom = new DOMDocument; $dom->Load('/path/to/file.xml'); foreach ($dom->getElementsByTagName('TEST') as $element) { $value = $element->nodeValue; //Text I want to manipulate // do stuff to $value $element->nodeValue = $value; // issue } $dom->save('/path/to/different/file.xml');

However when the xml file is saved, the CDATA is missing and I get

<TEST id="messageId">Manipulated text</TEST>

I have read I need to use createCDATASection() but I cannot quite figure out how to use it in this context. If I replace $element->nodeValue = $value with $dom->createCDATASection($value) then I just get the original unmodified XML file saved.

I want to get back to the original format but with the manipulated text

<TEST id="messageId"><![CDATA[Manipulated text]]></TEST>

cyberbit · Accepted Answer · 2016-06-01 17:01:40Z

You need to append the new CDATA node to the document. From the docs:

This function creates a new instance of class DOMCDATASection. This node will not show up in the document unless it is inserted with (e.g.) DOMNode::appendChild().

Try this code:

foreach ($dom->getElementsByTagName('TEST') as $element) { $value = $element->nodeValue; // do stuff to $value $element->removeChild($element->firstChild); $cdata = $dom->createCDATASection($value); $element->appendChild($cdata); }

splash58 · Accepted Answer · 2016-06-01 16:59:40Z

It can be done by next code

foreach ($dom->getElementsByTagName('TEST') as $element) { $value = $element->nodeValue; //Text I want to manipulate // do stuff to $value $new = $dom->createCDATASection($value); $element->parentNode->replaceChild($new, $element); } echo $dom->saveXML();

But foreach will break after removing current element. If you want to process some TEST tags, write so:

$tests = $dom->getElementsByTagName('TEST'); $ln = $tests->length; for($i = 0; $i < $ln; $i++) { $element = $tests->item(0); $value = $element->nodeValue; //Text I want to manipulate // do stuff to $value $new = $dom->createCDATASection($value); $element->parentNode->replaceChild($new, $element); } echo $dom->saveXML();

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