public static function note($msg, $opt = array(0, 0, 0), $is_assign = 1)
{
list($creator, $destination, $shared_id) = $opt;
$note = new Notifications();
$note->msg = $msg;
$note->time = time();
$note->creator_id = $creator;
$note->dest_id = $destination;
$note->shared_id = $shared_id;
$note->status = $is_assign == 2 ? 2 : 1;
return $note->validate() && $note->save();
}
