Document::getElementsByTagName

public function getElementsByTagName($tagName)
{
	$tagName = mb_strtoupper($tagName);
	$nodeList = $this->getQueryEngine()->walk(
		array(
			array(QueryEngine::FILTER_NODE_NAME => $tagName)
		),
		null, $this
	);

	if(Node::$isNodeListAsArray)
	{
		return $nodeList;
	}
	else
	{
		return new NodeList($nodeList);
	}
}