(PHP 4 >= 4.1.0)
DomNode->unlink_node — Deletes node
Diese Funktion ist bis jetzt nicht dokumentiert. Es steht nur die Liste der Argumente zur Verfügung.
<?xml version="1.0"?>
<galleries>
  <gallery title="test" intro="">
    <image/>
    <image/>
  </gallery>
  <gallery title="test1" intro="">
    <image/>
    <image/>
    <image/>
    <image/>
   </gallery>
  <gallery title="test2" intro="">
    <image/>
    <image/>
    <image/>
    <image/>
  </gallery>
</galleries> 
<?php
$dom = domxml_open_file($xmlfilename, DOMXML_LOAD_DONT_KEEP_BLANKS)
$x = $dom->get_elements_by_tagname('youtagname');
for($i=0;$i<count($x);$i++)
{
    // to remove a particular node by finding the 
    if($x[$i]->get_attribute('title')=="test1")
    {
        $remnode =  $x[$i]->node_name(); 
        $x[$i]->unlink_node($remnode);
        $dom->dump_file($xmlfilename, false, true);
    }
}
// Final xml will be like this:
?>
<?xml version="1.0"?>
<galleries>
  <gallery title="test" intro="">
    <image/>
    <image/>
  </gallery>
  <gallery title="test2" intro="">
    <image/>
    <image/>
    <image/>
    <image/>
  </gallery>
</galleries>
Njoi :)
I tried to use unlink_node to delete a node, but it never worked. 
However, you can delete a node with this:
function delNode($node){
                   $nud=$node->parent_node();
                   $nud->remove_child($node);
}
Just like dump_node*, this method requres the node as an argument.
Like this:
      $removeThis = $dom->get_element_by_id ('26');
      $unlinked = $removeThis->unlink_node($removeThis);
In the example above, $unlinked seems to be NULL.
I'm using 4.3.0-dev (build: Nov 14 2002 10:13:12) in Module mode on Apache/1.3.24 - Win2000.
* see: http://www.php.net/manual/en/function.domnode-dump-node.php