如何优化ThinkPHP文件缓存类代码实现高效缓存？

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php/** * 文件缓存类 */class Cache { const C_FILE='/Runtime/'; private $dir=''; const EXT='.tpl'; private $filename='';

public function __construct($dir='') { $this->dir=$dir; }}

<?php /** * @desc 文件缓存 * @edit www.lai18.com */ class Cache{ const C_FILE = '/Runtime/'; private $dir = ''; const EXT = '.tpl'; private $filename = ''; public function __construct($dir = ''){ $this->dir = $dir; } /** * @desc 设置文件缓存 * @param string $key 文件名 * @param unkonw $data 缓存数据 * @param int $expire 过期时间 */ public function set($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); } /** * @desc 获取文件 * @param string $key 文件名 */ public function get($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; } /** * @desc 删除文件 * @param string $key 文件名 */ public function del($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');