網上關於 PHP 緩存類的資料很多，不過這個類應該是我見過功能滿足需求，但又無比簡潔的一個。廢話不多說，直接看代碼吧！
使用說明：
1、實例化
$cache = new Cache();
2、設置緩存時間和緩存目錄
$cache = new Cache(60, '/any_other_path/');
第一個參數是緩存秒數，第二個參數是緩存路徑，根據需要配置。
默認情況下，緩存時間是 3600 秒，緩存目錄是 cache/
3、讀取緩存
$value = $cache->get('data_key');
4、寫入緩存
$value = $cache->put('data_key', 'data_value');
完整實例：
$cache = new Cache();
//從緩存從讀取鍵值 $key 的數據
$values = $cache->get($key);
//如果沒有緩存數據
if ($values == false) {
//insert code here...
//寫入鍵值 $key 的數據
$cache->put($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/
