Element::setAttributeNode

public function setAttributeNode(Attr $attr)
{
	if(self::$isNodeListAsArray)
	{
		$name = $attr->getName();
		$this->attributes[$name] = $attr;
	}
	else
	{
		$this->getAttributes()->setNamedItem($attr);
	}

	$attr->setParentNode($this);
}