【转】简单至极的 PHP 缓存类

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 } } ?>

原文出处：http://www.mangguo.org/the-simple-php-cache-class/