public static function array_merge_deep(array $dest, array $src, $appendIntegerKeys = true)
    {
        foreach ($src as $key => $value) {
            if (is_int($key) and $appendIntegerKeys) {
                $dest[] = $value;
            } elseif (isset($dest[$key]) and is_array($dest[$key]) and is_array($value)) {
                $dest[$key] = static::array_merge_deep($dest[$key], $value, $appendIntegerKeys);
            } else {
                $dest[$key] = $value;
            }
        }
        return $dest;
    }