自定义控制器中调用内置函数dr_get_file()返回

为什么自定义控制器中调用使用{dr_get_file(附件id)} 调用附件url返回的始终的json ，自定义控制器对应的前端模板中使用{dr_get_file(附件id)} 也是json

{"code":1,"msg":"获取成功","data":[{"id":"1","resume_id":"1","attach_type":"","file_name":"","file_path":"","file_size":null,"file_type":null,"upload_time":"2025-12-05 11:47:11","sort_order":"0","create_time":"2025-12-05 11:47:11","update_time":"2025-12-05 11:47:11"}]}

<?php namespace Phpcmf\Controllers;

/**
 * 二次开发时可以修改本文件，不影响升级覆盖
 */

class Resume extends \Phpcmf\Home\Module
{
    protected $resumeModel;

    public function __construct()
    {
        parent::__construct();
        $this->resumeModel = \Phpcmf\Service::M('resume', 'jianli');
    }
    
    public function index() {
    ...省略代码...
    
    //测试代码
            $photo_url = dr_get_file(193);
            echo $photo_url;  //返回的是json
            die;
            
                // 分配数据到模板
                \Phpcmf\Service::V()->assign([
                    'resume' => $resumeData
                ]);
                
                \Phpcmf\Service::V()->display('jianliedit.html');
    }
}