core/library/think/cache/driver/Lite.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;

/**
 * 文件类型缓存类
 * @author    liu21st <liu21st@gmail.com>
 */
class Lite extends Driver
{
    protected $options = [
        'prefix' => '',
        'path'   => '',
        'expire' => 0, // 等于 10*365*24*3600（10年）
    ];

    /**
     * 构造函数
     * @access public
     *
     * @param array $options
     */
    public function __construct($options = [])
    {
        if (!empty($options)) {
            $this->options = array_merge($this->options, $options);
        }
        if (substr($this->options['path'], -1) != DS) {
            $this->options['path'] .= DS;
        }

    }

    /**
     * 取得变量的存储文件名
     * @access protected
     * @param string $name 缓存变量名
     * @return string
     */
    protected function getCacheKey($name)
    {
        return $this->options['path'] . $this->options['prefix'] . md5($name) . '.php';
    }

    /**
     * 判断缓存是否存在
     * @access public
     * @param string $name 缓存变量名
     * @return mixed