original_string: private static function _get_db(): ?bbn\db
    {
      if ( self::$db && self::$db->check() ){
        return self::$db;
      }
      return null;
    }
code: private static function _get_db(): ?bbn\db
    {
      if ( self::$db && self::$db->check() ){
        return self::$db;
      }
      return null;
    }
code_tokens: private static function _get_db ( ) : ? bbn \ db { if ( self :: $ db && self :: $ db -> check ( ) ) { return self :: $ db ; } return null ; }
docstring: Returns the database connection object.
  
  @return bbn\db
docstring_tokens: Returns the database connection object .