php 文件缓存类

 //文件缓存类

 class FileCache {
  private $cacheTime = 3600;        //默认缓存时间   秒
     private $cacheDir = './filecache';    //缓存绝对路径
     private $md5 = true;              //是否对键进行加密
     private $suffix = ".php";         //设置文件后缀       

     public function __construct($config){
         if( is_array( $config ) ){
             foreach( $config as $key=>$val ){
                 $this->$key = $val;
             }
         }
     }        

     //设置缓存
     public function set($key,$val,$leftTime=null){
         $key = $this->md5 ? md5($key) : $key;
         $leftTime = $leftTime ? $leftTime : $this->cacheTime;
         !file_exists($this->cacheDir) && mkdir($this->cacheDir,0777);
         $file = $this->cacheDir.'/'.$key.$this->suffix;
         $val = serialize($val);
         @file_put_contents($file,$val) or $this->error(__line__,"文件写入失败");
         @chmod($file,0777)  or $this->error(__line__,"设定文件权限失败");
         @touch($file,time()+$leftTime) or $this->error(__line__,"更改文件时间失败");
     }   

     //得到缓存
     public function get($key){
         $this->clear();
         if( $this->_isset($key) ){
             $key_md5 = $this->md5 ? md5($key) : $key;
             $file = $this->cacheDir.'/'.$key_md5.$this->suffix;
             $val = file_get_contents($file);
             return unserialize($val);
         }
         return null;
     }        

     //判断文件是否有效
     public function _isset($key){
         $key = $this->md5 ? md5($key) : $key;
         $file = $this->cacheDir.'/'.$key.$this->suffix;
         if( file_exists($file) ){
             if( @filemtime($file) >= time() ){
                 return true;
             }else{
                 @unlink($file);
                 return false;
             }
         }
         return false;
     }        

     //删除文件
     public function _unset($key){
         if( $this->_isset($key) ){
             $key_md5 = $this->md5 ? md5($key) : $key;
             $file = $this->cacheDir.'/'.$key_md5.$this->suffix;
             return @unlink($file);
         }
         return false;
     }     

     //清除过期缓存文件
     public function clear(){
         $files = scandir($this->cacheDir);
         foreach ($files as $val){
             if (@filemtime($this->cacheDir."/".$val) < time()){
                 @unlink($this->cacheDir."/".$val);
             }
         }
     }       

     //清除所有缓存文件
     public function clear_all(){
         $files = scandir($this->cacheDir);
         foreach ($files as $val){
             @unlink($this->cacheDir."/".$val);
         }
     }        

     private function error($line,$msg){
         die("出错文件：".__file__."/n出错行：$line/n错误信息：$msg");
     }   

调用方法：
　　　　

 　　　　　　　　　　//cacheTime 缓存时间 1个小时
                    $cacheFile = new FileCache(array('cacheTime'=>3600,'suffix'=>'.php'));
                    $cache_1 =$cacheFile->get('key1');
                    $cache_2 =$cacheFile->get('key2');
                    if( $cache_1 ){
                        $resArr_result = $cache_1;
                    }else{
                        //读数据库$resArr_result = array(***);
                         //设置缓存
                         $cacheFile->set('key1',$resArr_result);
                    }