code: final public function getAuthorityTree() {
  
          $database = $this->database;
  
          $statement = $database->select()->from('?authority')->between("lft", '1', '6')->prepare();
          $results = $statement->execute();
  
          $right = array();
      }
docs: Returns the authority tree
  
  @uses Library\Datbase To get the user authority tree
  @return Array;