检查节点是否具有特定的子节点

I'm trying to find out if a DOM node has children nodes that have a certain name

$yes = false;
foreach($el->childNodes as $node){
  if($node->nodeName == 'foo'){
    $yes = true;
  }
}

Can I do this without iterating over the node list?

There a hasChildNodes function but it doesn't accept any node name argument :(

You can use XPath

$xpath = new DOMXPath($domDocument);
$elements = $xpath->query('/parentName/childName');
if ($elements->length) {
    // has child elements
}