超簡單的php緩存類

 
<?php
class Cache 
{
    private $dir = "data/cache/";//定義緩存目錄

    private $key='c_a_sss'; // 文件名 md5加密 密鑰


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 ))
    {
        if (! mkdir ( $path, 0777,true)) die ( '無法創建緩存文件夾' . $path );
    }
}
private function del_file($dir)
{ 
    if (is_dir($dir)) 
    { 
        $dh=opendir($dir);//打開目錄 //列出目錄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);
</pre>