PHP缓存类如何改写以适应长尾关键词查询？

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phpclass Cache { private $dir=data/cache/; private $key='c_a_sss';

function set_dir($dirpath) { $this->dir=$dirpath; $this->make_dir($this->dir); }

function read($key, $minutes=1) { $filename=$this->key; // ... }}

<?php 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 )) { if (! mkdir ( $path, 0777,true)) 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);