Dingo\Api\Routing\Router::mergeGroup PHP Method

    protected function mergeGroup(array $new, array $old)
    {
        $new['namespace'] = $this->formatNamespace($new, $old);
        $new['prefix'] = $this->formatPrefix($new, $old);
        foreach (['middleware', 'providers', 'scopes', 'before', 'after'] as $option) {
            $new[$option] = $this->formatArrayBasedOption($option, $new);
        }
        if (isset($new['domain'])) {
            unset($old['domain']);
        }
        if (isset($new['conditionalRequest'])) {
            unset($old['conditionalRequest']);
        }
        if (isset($new['uses'])) {
            $new['uses'] = $this->formatUses($new, $old);
        }
        $new['where'] = array_merge(Arr::get($old, 'where', []), Arr::get($new, 'where', []));
        if (isset($old['as'])) {
            $new['as'] = trim($old['as'] . '.' . Arr::get($new, 'as', ''), '.');
        }
        return array_merge_recursive(array_except($old, ['namespace', 'prefix', 'where', 'as']), $new);
    }