code: protected function dieOnNoMethod($method, $task)
      {
          if ($this->is_strict && ! method_exists($this, $method)) {
              $errormsg = sprintf('Cannot %s. Method %s() not in class %s.', $task, $method, get_class($this));
              trigger_error($errormsg, E_USER_ERROR);
          }
      }
docs: Triggers a PHP error if the method is not part of this object.
  
  @param string $method        Name of method.
  @param string $task          Description of task attempt.