code: function hasParent($tag = null, $recursive = false) {
  		if ($this->parent !== null) {
  			if ($tag === null) {
  				return true;
  			} elseif (is_string($tag)) {
  				return (($this->parent->tag === $tag) || ($recursive && $this->parent->hasParent($tag)));
  			} elseif (is_object($tag)) {
  				return (($this->parent === $tag) || ($recursive && $this->parent->hasParent($tag)));
  			}
  		}
  
  		return false;
  	}
docs: Find out if node has (a certain) parent
  @param DomNode|string $tag Match against parent, string to match tag, object to fully match node, null to return if node has parent
  @param bool $recursive
  @return bool