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                          代码如下:class Cache  { private $dir = "data/cache/";//定义缓存目录 private $key='c_a_sss';// 文件名md5加密密钥function set_dir($dirpath) { $this->dir=$dirpath; $this->make_dir($this->dir); } function read($key,$minutes=1) { $filename=$this->get_filename($key); if($datas = @file_get_contents($filename)) {  $datas = unserialize($datas);  if(time() - $datas['time'] < $minutes*60)  {  return $datas['data'];  } } return false; }function write($key,$data) { $filename=$this->get_filename($key); if($handle = fopen($filename,'w+')) { $datas = array('data'=>$data,'time'=>time()); flock($handle,LOCK_EX); $rs = fputs($handle,serialize($datas)); flock($handle,LOCK_UN); fclose($handle); if($rs!==false){return true; } } return false; } function clear_all() { $dir=$this->dir; $this->del_file($dir); }private function get_filename($key) { return $this->dir.$key.'_'.md5($key.$this->key); } private function make_dir($path) { if (! file_exists ( $path )) { $this->make_dir ( dirname ( $path ) ); if (! mkdir ( $path,0777 )) die ( '无法创建缓存文件夹' . $path ); } } private function del_file($dir) {  if (is_dir($dir))  {  $dh=opendir($dir);//打开目录 //列出目录中的所有文件并去掉 . 和 ..  while (false !== ( $file = readdir ($dh))) {  if($file!="." && $file!="..") { $fullpath=$dir."/".$file;  if(!is_dir($fullpath)) {  unlink($fullpath); } else {  $this->del_file($fullpath);  }  } } closedir($dh);  }  }  } 
$cache = new cache(); $cache->set_dir('data/cache_dir/'); $data=$cache->read('sys',1); if(empty($data)) { $data=array('aa'=>1111,'bb'=>2222,'date'=>date('Y-m-d H:i:s')); $cache->write('sys',$data); } print_r($data);
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