I have an XML file loaded into a DOM document, I wish to iterate through all 'foo' tags, getting values from every tag below it. I know I can get values via 

$element = $dom->getElementsByTagName('foo')->item(0);
foreach($element->childNodes as $node){
    $data[$node->nodeName] = $node->nodeValue;
}

However, what I'm trying to do, is from an XML like, 

<stuff>
  <foo>
    <bar></bar>
      <value/>
    <pub></pub>
  </foo>
  <foo>
    <bar></bar>
    <pub></pub>
  </foo>
  <foo>
    <bar></bar>
    <pub></pub>
  </foo>
  </stuff>

iterate over every foo tag, and get specific bar or pub, and get values from there. Now, how do I iterate over foo so that I can still access specific child nodes by name?

php xml dom
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