简单实例php 缓存文件生成技术实例

简单实例php教程 缓存文件生成技术实例
class Cache
{
protected $_cacheDir;

public function __construct()
{
$this->_cacheDir = "./cache";
}

public function setCacheDir($cacheDir)
{
if(empty($cacheDir)){
$this->_cacheDir = $this->_cacheDir;
}else{
$this->_cacheDir = $cacheDir;
}
}

public function getCache($name)
{
$file_path = $this->_cacheDir.'/namma_cache-'.$name;
if(!file_exists($file_path))
{
return false;
}
$handle = @fopen($file_path,'rb');
$data = @fread($handle,filesize($file_path));
return $this->unformatData($data);
@flose($handle);
}

public function setCache($name,$data)
{
$file_path = $this->_cacheDir.'/namma_cache-'.$name;
$data = $this->formatData($data);
$fp = fopen($file_path, 'w');
fwrite($fp,$data);
fclose($fp);
return $file_path;
}

public function formatData($data)
{
return serialize($data);
}

public function unformatData($data)
{
return unserialize($data);
}
}