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(PHP 5, PHP 7)
DOMNamedNodeMap::getNamedItemNS — Retrieves a node specified by local name and namespace URI
$namespaceURI 
   ,  string $localName 
   )
   Retrieves a node specified by localName and 
   namespaceURI.
  
namespaceURI The namespace URI of the node to retrieve.
localName The local name of the node to retrieve.
   A node (of any type) with the specified local name and namespace URI, or 
    NULL  if no node is found.