<?

  public function &photos_addTag(
		$pid, $tag_uid, $tag_text, $x, $y,
		$session_key = null, $format = null, $tags = null, $owner_uid = null)
  {
	if (!isset($session_key) and !isset($owner_uid))
		$session_key = $this->session_key;
	$args = array();
	foreach (array('pid', 'tag_uid', 'tag_text', 'x', 'y',
	'session_key', 'format', 'tags', 'owner_uid') as $key) {
		if (isset($$key))
			$args[$key] = $$key;
	}
    return $this->call_method('facebook.photos.getTags', $args);
  }