一个简洁的 PHP 缓存类代码，简单至极

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
}
}
?>

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