CacheFile.class.php
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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
defined('THINK_PATH') or exit();
/**
* 文件类型缓存类
* @category Think
* @package Think
* @subpackage Driver.Cache
* @author liu21st <liu21st@gmail.com>
*/
class CacheFile 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'] .= '/';
$this->init();
}
/**
* 初始化检查
* @access private
* @return boolen
*/
private function init() {
// 创建项目缓存目录
if (!is_dir($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 $expire 有效时间 0为永久
* @return boolen
*/
public function set($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 $name 缓存变量名
* @return boolen
*/
public function rm($name) {
return unlink($this->filename($name));
}
/**
* 清除缓存
* @access public
* @param string $name 缓存变量名
* @return boolen
*/
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;
}
}