Question

Hello
I’m making RSS reader and I’m using DOM.
Now I stuck, trying to reverse the order of the items in the DOMNodeList.
I can make it with 2 cycles – one to make it as array and one for rsort().
Is there any way to reverse the order in the DOMNodeList or must be done with “the array way”?

Answer 1

There is no method for reversing a DOMNodeList.

But you can keep it as it is, and if you need it, walk through it from the end to the start.

Example:

<?php
$doc=new DOMDocument;
$doc->loadXML('
<div>
  <span>1
    <span>2
      <span>3
      </span>
    </span>
  </span>
</div>');

$nodeList=$doc->getElementsByTagName('span');
for($n=$nodeList->length-1;$n>=0;--$n)
{
  echo $nodeList->item($n)->firstChild->data;//returns 321
}
?>

Just point at the end of the NodeList using NodeList->length, then decrement the index and access NodeList->item(index)