【thinkphp3.2.x】thinkphp3.2.x中有关file文件缓存相关的文件

<?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) {
$name	=	md5($name);
if(C('DATA_CACHE_SUBDIR')) {
// 使用子目录
$dir   ='';
for($i=0;$i<C('DATA_PATH_LEVEL');$i++) {
$dir	.=	$name{$i}.'/';
}
if(!is_dir($this->options['temp'].$dir)) {
mkdir($this->options['temp'].$dir,0755,true);
}
$filename	=	$dir.$this->options['prefix'].$name.'.php';
}else{
$filename	=	$this->options['prefix'].$name.'.php';
}
return $this->options['temp'].$filename;
}

/**
* 读取缓存
* @access public
* @param string $name 缓存变量名
* @return mixed
*/
public function get($name) {
$filename   =   $this->filename($name);
if (!is_file($filename)) {
return false;
}
N('cache_read',1);
$content    =   file_get_contents($filename);
if( false !== $content) {
$expire  =  (int)substr($content,8, 12);
if($expire != 0 && time() > filemtime($filename) + $expire) {
//缓存过期删除缓存文件
unlink($filename);
return false;
}
if(C('DATA_CACHE_CHECK')) {//开启数据校验
$check  =  substr($content,20, 32);
$content   =  substr($content,52, -3);
if($check != md5($content)) {//校验错误
return false;
}
}else {
$content   =  substr($content,20, -3);
}
if(C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
//启用数据压缩
$content   =   gzuncompress($content);
}
$content    =   unserialize($content);
return $content;
}
else {
return false;
}
}

/**
* 写入缓存
* @access public
* @param string $name 缓存变量名
* @param mixed $value  存储数据
* @param int $expire  有效时间 0为永久
* @return boolean
*/
public function set($name,$value,$expire=null) {
N('cache_write',1);
if(is_null($expire)) {
$expire =  $this->options['expire'];
}
$filename   =   $this->filename($name);
$data   =   serialize($value);
if( C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
//数据压缩
$data   =   gzcompress($data,3);
}
if(C('DATA_CACHE_CHECK')) {//开启数据校验
$check  =  md5($data);
}else {
$check  =  '';
}
$data    = "<?php\n//".sprintf('%012d',$expire).$check.$data."\n?>";
$result  =   file_put_contents($filename,$data);
if($result) {
if($this->options['length']>0) {
// 记录缓存队列
$this->queue($name);
}
clearstatcache();
return true;
}else {
return false;
}
}

/**
* 删除缓存
* @access public
* @param string $name 缓存变量名
* @return boolean
*/
public function rm($name) {
return unlink($this->filename($name));
}

/**
* 清除缓存
* @access public
* @param string $name 缓存变量名
* @return boolean
*/
public function clear() {
$path   =  $this->options['temp'];
$files  =   scandir($path);
if($files){
foreach($files as $file){
if ($file != '.' && $file != '..' && is_dir($path.$file) ){
array_map( 'unlink', glob( $path.$file.'/*.*' ) );
}elseif(is_file($path.$file)){
unlink( $path . $file );
}
}
return true;
}
return false;
}
}