网上关于 PHP 缓存类的资料很多,不过这个类应该是我见过功能满足需求,但又无比简洁的一个。废话不多说,直接看代码吧!
使用说明:
1、实例化
$cache = new Cache(); 2、设置缓存时间和缓存目录
$cache = new Cache(60,'/any_other_path/'); 第一个参数是缓存秒数,第二个参数是缓存路径,根据需要配置。 默认情况下,缓存时间是 3600 秒,缓存目录是 cache/
3、读取缓存
$value = $cache->get('data_key'); 4、写入缓存
$value = $cache->put('data_key','data_value'); 完整实例:
$cache = new Cache();
//从缓存从读取键值 $key 的数据 $values = $cache->get($key);
//如果没有缓存数据 if ($values == false) { //insert code here... //写入键值 $key 的数据 $cache->put($key,$values); } else { //insert code here... } Cache.class.php
<?php class Cache { private $cache_path;//path for the cache private $cache_expire;//seconds that the cache expires
//cache constructor,optional expiring time and cache path public function Cache($exp_time=3600,$path="cache/"){ $this->cache_expire=$exp_time; $this->cache_path=$path; }
//returns the filename for the cache private function fileName($key){ return $this->cache_path.md5($key); }
//creates new cache files with the given data,$key== name of the cache,data the info/values to store public function put($key,$data){ $values = serialize($data); $filename = $this->fileName($key); $file = fopen($filename,'w'); if ($file){//able to create the file fwrite($file,$values); fclose($file); } else return false; }
//returns cache for the given key public function get($key){ $filename = $this->fileName($key); if (!file_exists($filename) || !is_readable($filename)){//can't read the cache return false; } if ( time() < (filemtime($filename) + $this->cache_expire) ) {//cache for the key not expired $file = fopen($filename,"r");// read data file if ($file){//able to open the file $data = fread($file,filesize($filename)); fclose($file); return unserialize($data);//return the values } else return false; } else return false;//was expired you need to create new } } ?> 本文出自:http://www.mangguo.org/ (编辑:李大同)
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