code: function add(string $name, int $when, callable $callback, $param = null, bool $persistent) {
          if (isset($this->_tasks[$name]))
              Console::warning("Overwriting cron task \"$name\".");
          $this->_tasks[$name] = [
              0 => $when,
              1 => $callback,
              2 => $param,
              3 => $persistent
          ];
      }
docs: 新建计划任务
  
  @param string $name
  @param int $when
  @param callable $callback
  @param null $param
  @param bool $persistent