php文件缓存类实例整理
缓存类是我们开发应用中会常用使用到的功能,下面我来给大家整理几个php文件缓存类了,各个文件缓存类写法不同,但在性能上会有区别,有兴趣测试的朋友可测试一下这些缓存类吧.
例1,代码如下:
- <?php
- $fzz = new fzz_cache;
- $fzz->kk = $_SERVER;
-
- print_r($fzz->kk);
-
-
-
- var_dump(isset($fzz->kk));
-
-
-
- class fzz_cache{
- public $limit_time = 20000;
- public $cache_dir = "data";
-
-
- function __set($key , $val){
- $this->_set($key ,$val);
- }
-
- function _set($key ,$val,$limit_time=null){
- $limit_time = $limit_time ? $limit_time : $this->limit_time;
- $file = $this->cache_dir."/".$key.".cache";
- $val = serialize($val);
- @file_put_contents($file,$val) or $this->error(__line__,"fail to write in file");
- @chmod($file,0777);
- @touch($file,time()+$limit_time) or $this->error(__line__,"fail to change time");
- }
-
-
-
- function __get($key){
- return $this->_get($key);
- }
- function _get($key){
- $file = $this->cache_dir."/".$key.".cache";
- if (@filemtime($file)>=time()){
- return unserialize(file_get_contents($file));
- }else{
- @unlink($file) or $this->error(__line__,"fail to unlink");
- return false;
- }
- }
-
-
-
- function __unset($key){
- return $this->_unset($key);
- }
- function _unset($key){
- if (@unlink($this->cache_dir."/".$key.".cache")){
- return true;
- }else{
- return false;
- }
- }
-
-
-
- function __isset($key){
- return $this->_isset($key);
- }
- function _isset($key){
- $file = $this->cache_dir."/".$key.".cache";
- if (@filemtime($file)>=time()){
- return true;
- }else{
- @unlink($file) ;
- return false;
- }
- }
-
-
-
- function clear(){
- $files = scandir($this->cache_dir);
- foreach ($files as $val){
- if (filemtime($this->cache_dir."/".$val)<time()){
- @unlink($this->cache_dir."/".$val);
- }
- }
- }
-
-
-
- function clear_all(){
- $files = scandir($this->cache_dir);
- foreach ($files as $val){
- @unlink($this->cache_dir."/".$val);
- }
- }
-
- function error($msg,$debug = false) {
- $err = new Exception($msg);
- $str = "<pre>
- <span style='color:red'>error:</span>
- ".print_r($err->getTrace(),1)."
- </pre>";
- if($debug == true) {
- file_put_contents(date('Y-m-d H_i_s').".log",$str);
- return $str;
- }else{
- die($str);
- }
- }
- }
- ?>
例2.从CI社区的stblog和CI的file_helper类中提取出来的php文件缓存类,一个简单的基于文件的key->value缓存类。
这个类可以用来缓存一些基本信息,比如博客的header,footer,sidebar中的一些不经常变化,从数据库中取出的内容,取数据前先判断文件缓存中的内容是否过期,如果没过期取出来,过期了则连接数据库查询,并将结果重新写入文件缓存,更新过期时间。跟memcache使用类似,不过更方便。用在一些小的应用上足够了...代码如下:
- <?php
- define('DIRECTORY_SEPARATOR','/');
- define('FOPEN_WRITE_CREATE_DESTRUCTIVE','wb');
- define('FOPEN_WRITE_CREATE','ab');
- define('DIR_WRITE_MODE', 0777);
- class FileCache {
-
-
-
-
-
-
-
- private $_cache_path;
-
-
-
-
-
-
-
- private $_cache_expire;
-
-
-
-
-
-
-
- public function __construct($expire, $cache_path)
- {
- $this->_cache_expire = $expire;
- $this->_cache_path = $cache_path;
- }
-
-
-
-
-
-
-
-
- private function _file($key)
- {
- return $this->_cache_path . md5($key);
- }
-
-
-
-
-
-
-
-
-
- public function set($key, $data)
- {
- $value = serialize($data);
-
- $file = $this->_file($key);
-
- return $this->write_file($file, $value);
- }
-
-
-
-
-
-
-
-
- public function get($key)
- {
- $file = $this->_file($key);
-
-
- if (!file_exists($file) || !$this->is_really_writable($file))
- {
- return false;
- }
-
-
- if ( time() < (filemtime($file) + $this->_cache_expire) )
- {
-
- $data = $this->read_file($file);
-
- if(FALSE !== $data)
- {
- return unserialize($data);
- }
-
- return FALSE;
- }
-
-
- @unlink($file);
- return FALSE;
- }
-
- function read_file($file)
- {
- if ( ! file_exists($file))
- {
- return FALSE;
- }
-
- if (function_exists('file_get_contents'))
- {
- return file_get_contents($file);
- }
-
- if ( ! $fp = @fopen($file, FOPEN_READ))
- {
- return FALSE;
- }
-
- flock($fp, LOCK_SH);
-
- $data = '';
- if (filesize($file) > 0)
- {
- $data =& fread($fp, filesize($file));
- }
-
- flock($fp, LOCK_UN);
- fclose($fp);
-
- return $data;
- }
-
- function write_file($path, $data, $mode = FOPEN_WRITE_CREATE_DESTRUCTIVE)
- {
- if ( ! $fp = @fopen($path, $mode))
- {
- return FALSE;
- }
-
- flock($fp, LOCK_EX);
- fwrite($fp, $data);
- flock($fp, LOCK_UN);
- fclose($fp);
-
- return TRUE;
- }
- function is_really_writable($file)
- {
-
- if (DIRECTORY_SEPARATOR == '/' AND @ini_get("safe_mode") == FALSE)
- {
- return is_writable($file);
- }
-
-
-
- if (is_dir($file))
- {
- $file = rtrim($file, '/').'/'.md5(rand(1,100));
-
- if (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
- {
- return FALSE;
- }
-
- fclose($fp);
- @chmod($file, DIR_WRITE_MODE);
- @unlink($file);
- return TRUE;
- }
- elseif (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE)
- {
- return FALSE;
- }
-
- fclose($fp);
- return TRUE;
- }
- }
- $cache = new FileCache(30,'cache/');
- $cache->set('test','this is a test.');
- print $cache->get('test');
-
- ?>
例3.自己觉得很好用的php文件缓存,代码如下:
- <?php
- class cache
- {
- private static $_instance = null;
-
- protected $_options = array(
- 'cache_dir' => "./",
- 'file_name_prefix' => 'cache',
- 'mode' => '1',
- );
-
-
-
-
-
-
- public static function getInstance()
- {
- if(self::$_instance === null)
- {
- self::$_instance = new self();
- }
- return self::$_instance;
- }
-
-
-
-
-
-
-
- public static function get($id)
- {
- $instance = self::getInstance();
-
-
- if(!$instance->has($id))
- {
- return false;
- }
-
- $file = $instance->_file($id);
-
- $data = $instance->_fileGetContents($file);
-
- if($data['expire'] == 0 || time() < $data['expire'])
- {
- return $data['contents'];
- }
- return false;
- }
-
-
-
-
-
-
-
-
- public static function set($id, $data, $cacheLife = 0)
- {
- $instance = self::getInstance();
-
- $time = time();
- $cache = array();
- $cache['contents'] = $data;
- $cache['expire'] = $cacheLife === 0 ? 0 : $time + $cacheLife;
- $cache['mtime'] = $time;
-
- $file = $instance->_file($id);
-
- return $instance->_filePutContents($file, $cache);
- }
-
-
-
-
-
-
-
- public static function delete($id)
- {
- $instance = self::getInstance();
-
- if(!$instance->has($id))
- {
- return false;
- }
- $file = $instance->_file($id);
-
- return unlink($file);
- }
-
-
-
-
-
-
-
- public static function has($id)
- {
- $instance = self::getInstance();
- $file = $instance->_file($id);
-
- if(!is_file($file))
- {
- return false;
- }
- return true;
- }
-
-
-
-
-
-
- protected function _file($id)
- {
- $instance = self::getInstance();
- $fileNmae = $instance->_idToFileName($id);
- return $instance->_options['cache_dir'] . $fileNmae;
- }
-
-
-
-
-
-
-
- protected function _idToFileName($id)
- {
- $instance = self::getInstance();
- $prefix = $instance->_options['file_name_prefix'];
- return $prefix . '---' . $id;
- }
-
-
-
-
-
-
-
- protected function _fileNameToId($fileName)
- {
- $instance = self::getInstance();
- $prefix = $instance->_options['file_name_prefix'];
- return preg_replace('/^' . $prefix . '---(.*)$/', '$1', $fileName);
- }
-
-
-
-
-
-
-
-
- protected function _filePutContents($file, $contents)
- {
- if($this->_options['mode'] == 1)
- {
- $contents = serialize($contents);
- }
- else
- {
- $time = time();
- $contents = "<?phpn".
- " // mktime: ". $time. "n".
- " return ".
- var_export($contents, true).
- "n?>";
- }
-
- $result = false;
- $f = @fopen($file, 'w');
- if ($f) {
- @flo