vendor/topthink/framework/src/think/response/Xml.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2021 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\response;

use think\Collection;
use think\Cookie;
use think\Model;
use think\Response;

/**
 * XML Response
 */
class Xml extends Response
{
    // 输出参数
    protected $options = [
        // 根节点名
        'root_node' => 'think',
        // 根节点属性
        'root_attr' => '',
        //数字索引的子节点名
        'item_node' => 'item',
        // 数字索引子节点key转换的属性名
        'item_key'  => 'id',
        // 数据编码
        'encoding'  => 'utf-8',
    ];

    protected $contentType = 'text/xml';

    public function __construct(Cookie $cookie, $data = '', int $code = 200)
    {
        $this->init($data, $code);
        $this->cookie = $cookie;
    }

    /**
     * 处理数据
     * @access protected
     * @param  mixed $data 要处理的数据
     * @return mixed
     */
    protected function output($data): string
    {
        if (is_string($data)) {
            if (0 !== strpos($data, '<?xml')) {
                $encoding = $this->options['encoding'];
                $xml      = "<?xml version=\"1.0\" encoding=\"{$encoding}\"?>";
                $data     = $xml . $data;
            }