一个简单至极的PHP缓存类代码

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：

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$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

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<?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 } } ?>