Home  >  Article  >  Backend Development  >  简单的php缓存类分享 php缓存机制_PHP

简单的php缓存类分享 php缓存机制_PHP

WBOY
WBOYOriginal
2016-06-01 11:56:42921browse

复制代码 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']     {
     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);

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn