//文件缓存类
class FileCache {
private $cacheTime = 3600; //默认缓存时间 秒
private $cacheDir = './filecache'; //缓存绝对路径
private $md5 = true; //是否对键进行加密
private $suffix = ".php"; //设置文件后缀
public function __construct($config){
if( is_array( $config ) ){
foreach( $config as $key=>$val ){
$this->$key = $val;
}
}
}
//设置缓存
public function set($key,$val,$leftTime=null){
$key = $this->md5 ? md5($key) : $key;
$leftTime = $leftTime ? $leftTime : $this->cacheTime;
!file_exists($this->cacheDir) && mkdir($this->cacheDir,0777);
$file = $this->cacheDir.'/'.$key.$this->suffix;
$val = serialize($val);
@file_put_contents($file,$val) or $this->error(__line__,"文件写入失败");
@chmod($file,0777) or $this->error(__line__,"设定文件权限失败");
@touch($file,time()+$leftTime) or $this->error(__line__,"更改文件时间失败");
}
//得到缓存
public function get($key){
$this->clear();
if( $this->_isset($key) ){
$key_md5 = $this->md5 ? md5($key) : $key;
$file = $this->cacheDir.'/'.$key_md5.$this->suffix;
$val = file_get_contents($file);
return unserialize($val);
}
return null;
}
//判断文件是否有效
public function _isset($key){
$key = $this->md5 ? md5($key) : $key;
$file = $this->cacheDir.'/'.$key.$this->suffix;
if( file_exists($file) ){
if( @filemtime($file) >= time() ){
return true;
}else{
@unlink($file);
return false;
}
}
return false;
}
//删除文件
public function _unset($key){
if( $this->_isset($key) ){
$key_md5 = $this->md5 ? md5($key) : $key;
$file = $this->cacheDir.'/'.$key_md5.$this->suffix;
return @unlink($file);
}
return false;
}
//清除过期缓存文件
public function clear(){
$files = scandir($this->cacheDir);
foreach ($files as $val){
if (@filemtime($this->cacheDir."/".$val) < time()){
@unlink($this->cacheDir."/".$val);
}
}
}
//清除所有缓存文件
public function clear_all(){
$files = scandir($this->cacheDir);
foreach ($files as $val){
@unlink($this->cacheDir."/".$val);
}
}
private function error($line,$msg){
die("出错文件：".__file__."/n出错行：$line/n错误信息：$msg");
}
调用方法：
//cacheTime 缓存时间 1个小时
$cacheFile = new FileCache(array('cacheTime'=>3600,'suffix'=>'.php'));
$cache_1 =$cacheFile->get('key1');
$cache_2 =$cacheFile->get('key2');
if( $cache_1 ){
$resArr_result = $cache_1;
}else{
//读数据库$resArr_result = array(***);
//设置缓存
$cacheFile->set('key1',$resArr_result);
}