Deployer\Server\Environment::add PHP Method

    public function add($name, $array)
    {
        if ($this->has($name)) {
            $config = $this->get($name);
            if (!is_array($config)) {
                throw new \RuntimeException("Configuration parameter `{$name}` isn't array.");
            }
            $this->set($name, array_merge($config, $array));
        } else {
            $this->set($name, $array);
        }
    }