ThinkPHP文件缓存类代码分享

取自ThinkPHP的文件缓存类代码，这里就不多废话了，小伙伴们自己看注释吧。

dir = $dir;
      
    }
    
    public function set($key,$data,$expire = 0){
      $this->filename =   dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT;
      if(file_exists($this->filename)){
 $res = $this->get($key);
 if(md5($res) == md5(json_encode($data) ) ){
   return true;
 }
      }
      if(!is_dir(dirname($this->filename))){
 mkdir(dirname($this->filename),0777);
      }
      
      $source = fopen($this->filename,'w+');
      fwrite($source,json_encode($data));
      fclose($source);
    }
    
    
    public function get($key){
      //$filename = dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT;
      if(!file_exists($this->filename)){
 return '缓存文件已经不存在';
      }else{
 $res = file_get_contents($this->filename);
      }
      return $res;
    }
    
    public function del($key){
      unlink($this->filename);
    }
    
  }
  
  $data = array('name'=>'song','age'=>20,'sex'=>'man','favority'=>array('apple','banana'));
  $cache = new Cache();
  $cache->set('cache',$data);
  //$cache->get('cache');
  //$cache->del('cache');