ThinkPHP/Library/Think/Cache/Driver/File.class.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 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;
defined('THINK_PATH') or exit();
/**
 * 文件类型缓存类
 */
class File extends Cache {

    /**
     * 架构函数
     * @access public
     */
    public function __construct($options=array()) {
        if(!empty($options)) {
            $this->options =  $options;
        }
        $this->options['temp']      =   !empty($options['temp'])?   $options['temp']    :   C('DATA_CACHE_PATH');
        $this->options['prefix']    =   isset($options['prefix'])?  $options['prefix']  :   C('DATA_CACHE_PREFIX');
        $this->options['expire']    =   isset($options['expire'])?  $options['expire']  :   C('DATA_CACHE_TIME');
        $this->options['length']    =   isset($options['length'])?  $options['length']  :   0;
        if(substr($this->options['temp'], -1) != '/')    $this->options['temp'] .= '/';
        $this->init();
    }

    /**
     * 初始化检查
     * @access private
     * @return boolean
     */
    private function init() {
        // 创建应用缓存目录
        if (!is_dir($this->options['temp'])) {
            mkdir($this->options['temp']);
        }
    }

    /**
     * 取得变量的存储文件名
     * @access private
     * @param string $name 缓存变量名
     * @return string
     */
    private function filename($name) {
        $name	=	md5(C('DATA_CACHE_KEY').$name);
        if(C('DATA_CACHE_SUBDIR')) {
            // 使用子目录
            $dir   ='';
            for($i=0;$i<C('DATA_PATH_LEVEL');$i++) {
                $dir	.=	$name{$i}.'/';
            }