SimpleXML – Remove xpath node

by 
<?php
$xml = new SimpleXMLElement('<a><b/></a>');
unset($xml->b);
echo $xml->asxml();

this works as intended (removing the <b/> element fromt he document) because the __unset() method (or the equivalent in the modules code) is called.
But when you call unset($parent); it only removes the object reference stored in $parent, but it doesn’t affect the object itself or the document stored in $xml.
I’d revert to DOMDocument for this.

<?php
$doc = new DOMDOcument;
$doc->loadxml('<foo>
  <items>
    <info>
      <item_id>123</item_id>
    </info>
  </items>
  <items>
    <info>
      <item_id>456</item_id>
    </info>
  </items>
  <items>
    <info>
      <item_id>789</item_id>
    </info>
  </items>
</foo>');
$item_id = 456;

$xpath = new DOMXpath($doc);
foreach($xpath->query('//items[info/item_id="' . $item_id . '"]') as $node) {
  $node->parentNode->removeChild($node);
}
echo $doc->savexml();

prints

<?xml version="1.0"?>
<foo>
  <items>
    <info>
      <item_id>123</item_id>
    </info>
  </items>

  <items>
    <info>
      <item_id>789</item_id>
    </info>
  </items>
</foo>

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