thinkphp/library/think/cache/driver/File.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\cache\driver;

use think\cache\Driver;
use think\Container;

/**
 * 文件类型缓存类
 * @author    liu21st <liu21st@gmail.com>
 */
class File extends Driver
{
    protected $options = [
        'expire'        => 0,
        'cache_subdir'  => true,
        'prefix'        => '',
        'path'          => '',
        'hash_type'     => 'md5',
        'data_compress' => false,
        'serialize'     => true,
    ];

    protected $expire;

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

        if (empty($this->options['path'])) {
            $this->options['path'] = Container::get('app')->getRuntimePath() . 'cache' . DIRECTORY_SEPARATOR;
        } elseif (substr($this->options['path'], -1) != DIRECTORY_SEPARATOR) {
            $this->options['path'] .= DIRECTORY_SEPARATOR;
        }

        $this->init();
    }

    /**
     * 初始化检查
     * @access private
     * @return boolean
     */
    private function init()
    {