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...

}

<?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

  }

}

?>