ManaPHP\Component::__isset PHP Метод

    public function __isset($name)
    {
        if ($name === 'di' || $name === 'persistent') {
            return true;
        }
        if ($this->_dependencyInjector === null) {
            $this->_dependencyInjector = Di::getDefault();
        }
        return $this->_dependencyInjector->has($name);
    }