Modify XML attribute PHP DOM

php, xml

Solution

Not sure what you want to do exactly, but the general idea is :

- You must instanciate `DOMDocument`

- and load your XML strings with it : `DOMDocument::loadXML`

- Then, you must instanciate `DOMXpath` on that document

- And use it to query the document : `DOMXPath::query`

- One you have found the node that interests you, you can manipulate it

- for example, you can set the value of an attribute : `DOMElement::setAttribute`

Here, for example, you could use some thing like this :

$str = <<<XML
    <collections id="My Collections">
     <category id="my category">
       <record id="my record">
         <title>Some Info</title>
       </record>
     </category>
    </collections>
XML;

$dom = new DOMDocument();
$dom->loadXML($str);

$xpath = new DOMXPath($dom);
$elements = $xpath->query('//record[@id="my record"]');
if ($elements->length >= 1) {
    $element = $elements->item(0);
    $element->setAttribute('id', "glop !");
}
echo '<pre>' . htmlspecialchars($dom->saveXML()) . '</pre>';

This will replace the `id` attribute `my record`, on the node that's identified by it, by "`glop !`", and you'd get the following XML as output :

<?xml version="1.0"?>
<collections id="My Collections">
     <category id="my category">
       <record id="glop !">
         <title>Some Info</title>
       </record>
     </category>
    </collections>

Problem

Original source