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

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 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\Exception;
use think\Response;

/**
 * File Response
 */
class File extends Response
{
    protected $expire = 360;
    protected $name;
    protected $mimeType;
    protected $isContent = false;

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

    /**
     * 处理数据
     * @access protected
     * @param  mixed $data 要处理的数据
     * @return mixed
     * @throws \Exception
     */
    protected function output($data)
    {
        if (!$this->isContent && !is_file($data)) {
            throw new Exception('file not exists:' . $data);
        }

        ob_end_clean();

        if (!empty($this->name)) {
            $name = $this->name;
        } else {
            $name = !$this->isContent ? pathinfo($data, PATHINFO_BASENAME) : '';
        }

        if ($this->isContent) {
            $mimeType = $this->mimeType;
            $size     = strlen($data);
        } else {
            $mimeType = $this->getMimeType($data);
            $size     = filesize($data);
        }