(PHP 5, PHP 7)
DOMElement::removeAttributeNS — Removes attribute
$namespaceURI
   , string $localName
   )
   Removes attribute is namespace namespaceURI 
   named localName from the element.
  
namespaceURIThe namespace URI.
localNameThe local name.
   Returns TRUE on success or FALSE on failure.
  
DOM_NO_MODIFICATION_ALLOWED_ERRRaised if the node is readonly.