AppserverIo\Appserver\Core\AbstractManager::getAttribute PHP Метод

Returns the attribute with the passed key from the container.

public getAttribute ( string $key ) : mixed \| null
$key	string	The key the requested value is registered with
Результат	mixed \| null	The requested value if available

    public function getAttribute($key)
    {
        if ($this->data->has($key)) {
            return $this->data->get($key);
        }
    }

AbstractManager