<?php
/*
* Name: fileCache
* URL: http:/neo22s.com/
* Version: v0.1
* Date: 18/12/2009
* Author: Chema Garrido
* Support: http://forum.neo22s.com
* License: GPL v3
* Notes: fileCache class, used in phpMydb
*/
/////////////////////class cache
class fileCache {
private $cache_path;//path for the cache
private $cache_expire;//seconds that the cache expires
private $application;//application object like in ASP
private $application_file;//file for the application object
//cache constructor, optional expiring time and cache path
public function fileCache($exp_time=3600,$path="cache/"){
$this->cache_expire=$exp_time;
$this->cache_path=$path;
$this->APP_start();//starting application cache with filename...
}
//returns the filename for the cache
private function fileName($key){
return $this->cache_path.md5($key);
}
//deletes cache from folder
public function deleteCache($older_than=""){
if (!is_numeric($older_than)) $older_than=$this->cache_expire;
$files = scandir($this->cache_path);
foreach($files as $file){
if (strlen($file)>2 && time() > (filemtime($this->cache_path.$file) + $older_than) ) {
unlink($this->cache_path.$file);//echo "<br />-".$file;
}
}
}
//write or read the cache
public function cache($key, $value=""){
if ($value!=""){//wants to wirte
if ($this->get($key)!=$value){//only write if it's different
$this->put($key, $value);
}
}
else return $this->get($key);//reading
}
//creates new cache files with the given data, $key== name of the cache, data the info/values to store
private function put($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
private 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($data);//return the values
}
else return false;
}
else return false;//was expired you need to create new
}
//load variables from the file
private function APP_start ($app_file="application"){
$this->application_file=$app_file;
if (file_exists($this->cache_path.$this->application_file)){ // if data file exists, load the cached variables
$file = fopen($this->cache_path.$this->application_file, "r");// read data file
if ($file){
$data = fread($file, filesize($this->cache_path.$this->application_file));
fclose($file);
}
// build application variables from data file
$this->application = unserialize($data);
}
else fopen($this->cache_path.$this->application_file, "w");//if the file does not exist we create it
//erase the cache every X minutes before loading next time
$app_time=filemtime($this->cache_path.$this->application_file)+$this->cache_expire;
if (time()>$app_time) unlink ($this->cache_path.$this->application_file);//erase the cache
}
// write application data to file
private function APP_write(){
$data = serialize($this->application);
$file = fopen($this->cache_path.$this->application_file, "w");
if ($file){
fwrite($file, $data);
fclose($file);
}
}
//returns the value or stores it
public function APP($var,$value=""){
if ($value!=""){//wants to wirte
if ($this->application[md5($var)]!=$value){
$this->application[md5($var)]=$value;
$this->APP_write();
}
}
else {//reading
$return=$this->application[md5($var)];
if (!isset($return)) return false;//nothing found
else return $return;//return value
}
}
}
?>
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