src/Application/Config.php
public function merge(Config $config): Config
    {
        $this->config = array_merge_recursive($this->config, $config->config);

        return $this;
    }
public function merge(Config $config): Config
    {
        $this->config = array_merge_recursive($this->config, $config->config);

        return $this;
    }
public function merge ( Config $ config ) : Config { $ this -> config = array_merge_recursive ( $ this -> config , $ config -> config ) ; return $ this ; }
Merges one instance of Config class into current one and
returns current instance.

@param Config $config
@return Config
Merges one instance of Config class into current one and returns current instance .