PHP 統一接口響應類：支援 JSON 與 XML 格式切換

Response 類封裝：標準化 code/message/data 結構

為前後端分離提供統一數據格式，支援按需輸出 JSON 或 XML。核心方法 show() 根據 $type 參數分發。

完整類代碼

<?php
class Response {
    /** 綜合輸出入口 */
    public static function show($code, $message, $data = [], $type = '') {
        if (!is_numeric($code)) return '';
        $result = ['code' => $code, 'message' => $message, 'data' => $data];
        if ($type === 'json') return self::json($code, $message, $data);
        if ($type === 'xml')  return self::xml($code, $message, $data);
        return ''; // TODO: 其他格式
    }

    /** JSON 輸出 */
    public static function json($code, $message, $data = []) {
        if (!is_numeric($code)) return '';
        return json_encode(['code' => $code, 'message' => $message, 'data' => $data]);
    }

    /** XML 輸出 */
    public static function xml($code, $message, $data = []) {
        if (!is_numeric($code)) return '';
        header("Content-Type:text/xml");
        $xml = "<?xml version='1.0' encoding='UTF-8'?>\n<root>\n";
        $xml .= self::xmlToEncode($data);
        $xml .= "</root>";
        return $xml;
    }

    /** 遞歸生成 XML 節點 */
    private static function xmlToEncode($data) {
        $xml = '';
        foreach ($data as $key => $value) {
            $attr = is_numeric($key) ? "id='{$key}'" : '';
            $tag = is_numeric($key) ? 'item' : $key;
            $xml .= "<{$tag} {$attr}>\n";
            $xml .= is_array($value) ? self::xmlToEncode($value) : "{$value}\n";
            $xml .= "</{$tag}>\n";
        }
        return $xml;
    }
}
?>

測試示例

<?php
$grade = [
    "score" => [70, 95, 70.0, 60, "70"],
    "name"  => ["Zhang San", "Li Si", "Wang Wu", "Zhao Liu", "TianQi"]
];
$response = new Response();
$result = $response::show(200, 'success', $grade, 'json');
print_r($result);
// 輸出: {"code":200,"message":"success","data":{"score":[70,95,70,60,"70"],"name":["Zhang San","Li Si","Wang Wu","Zhao Liu","TianQi"]}}
?>

若傳 'xml' 則輸出對應 XML 結構。此類易於擴展支持更多格式。