vendor/topthink/framework/src/think/cache/driver/File.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\cache\driver;

use FilesystemIterator;
use think\App;
use think\cache\Driver;

/**
 * 文件缓存类
 */
class File extends Driver
{
    /**
     * 配置参数
     * @var array
     */
    protected $options = [
        'expire'        => 0,
        'cache_subdir'  => true,
        'prefix'        => '',
        'path'          => '',
        'hash_type'     => 'md5',
        'data_compress' => false,
        'tag_prefix'    => 'tag:',
        'serialize'     => [],
    ];

    /**
     * 架构函数
     * @param App   $app
     * @param array $options 参数
     */
    public function __construct(App $app, array $options = [])
    {
        if (!empty($options)) {
            $this->options = array_merge($this->options, $options);
        }

        if (empty($this->options['path'])) {
            $this->options['path'] = $app->getRuntimePath() . 'cache';
        }

        if (substr($this->options['path'], -1) != DIRECTORY_SEPARATOR) {
            $this->options['path'] .= DIRECTORY_SEPARATOR;
        }
    }

    /**
     * 取得变量的存储文件名