phpbb\install\helper\iohandler\iohandler_interface::add_log_message PHP Method

    public function add_log_message($log_title, $log_description = false);

 /**
  * {@inheritdoc}
  */
 public function write($message, $verbosity)
 {
     if ($verbosity <= migrator_output_handler_interface::VERBOSITY_VERBOSE) {
         $this->iohandler->add_log_message($message);
         $this->iohandler->send_response();
     }
 }