private function createArrayLines(array $data, $prefix = '')
    {
        $content = '';

        foreach ($data as $key => $value) {
            $newKey = "{$prefix}[$key]";

            if (is_array($value)) {
                $content .= $this->createArrayLines($value, $newKey);
                continue;
            }

            $content .= $this->createPropertyLine($newKey, $value);
        }

        return $content;
    }