<?php
/* class.FastCache.php
* Copyright (C) 1999-2005 Jacob Stetser/icongarden.com
* cacheable() attributed to Troels Arvin ([email protected])
*
* This library is free software; and provided under a
* Creative Commons Attribution-ShareAlike license.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
*/
// FastCache
// Jacob Stetser <[email protected]>
// 08/26/1999 12:34
class FastCache {
var $CACHE_PATH = "./cache"; // Set default cache path to
// current directory + /cache
var $UMASK = "0111"; // Change this to fit your needs.
var $CACHE_KEY = "";
var $CACHE_SUFFIX = ".cache";
var $CTRL_SUFFIX = ".ctrl";
function FastCache($cache_path="") {
if(isset($cache_path)) {
$this->CACHE_PATH = $cache_path;
}
}
function make_key($page_path_info) {
$cache_key = md5($page_path_info);
$this->CACHE_KEY = $cache_key;
return $cache_key;
}
function update_control() {
@touch($this->CACHE_PATH.$this->CACHE_KEY.$this->CTRL_SUFFIX);
return;
}
function update($html) {
flush();
if(isset($this->UMASK)) {
umask($this->UMASK);
}
$cache_ctrl = $this->CACHE_KEY.$this->CTRL_SUFFIX;
$cache_file = $this->CACHE_KEY.$this->CACHE_SUFFIX;
if(!file_exists($this->CACHE_PATH.$cache_ctrl)) {
@touch($this->CACHE_PATH.$cache_ctrl);
}
if(file_exists($this->CACHE_PATH.$cache_file)) {
$temp_name = tempnam($this->CACHE_PATH."temp","fastcache-");
$fp = fopen($temp_name,"w");
fputs($fp,$html);
fputs($fp,"<!-- This file came from the cache -->");
fclose($fp);
rename($this->CACHE_PATH.$cache_file,$this->CACHE_PATH.$cache_file."bak");
copy($temp_name,$this->CACHE_PATH.$cache_file);
unlink($temp_name);
unlink($this->CACHE_PATH.$cache_file."bak");
} else {
$temp_name = tempnam($this->CACHE_PATH."temp","fastcache-");
$fp = fopen($temp_name,"w");
fputs($fp,$html);
fputs($fp,"<!-- This file came from the cache -->");
fclose($fp);
copy($temp_name,$this->CACHE_PATH.$cache_file);
unlink($temp_name);
}
return;
}
function cache_exists() {
if(file_exists($this->CACHE_PATH.$this->CACHE_KEY.$this->CACHE_SUFFIX) && file_exists($this->CACHE_PATH.$this->CACHE_KEY.$this->CTRL_SUFFIX)) {
return 1;
} else {
return 0;
}
}
function compare_cache() {
if(filemtime($this->CACHE_PATH.$this->CACHE_KEY.$this->CACHE_SUFFIX) >= filemtime($this->CACHE_PATH.$this->CACHE_KEY.$this->CTRL_SUFFIX)) {
return 1;
} else {
return 0;
}
}
function print_cache(){
readfile($this->CACHE_PATH.$this->CACHE_KEY.$this->CACHE_SUFFIX);
return;
}
function fetch($cache_key){
$html = join(file($this->CACHE_PATH.$this->CACHE_KEY.$this->CACHE_SUFFIX));
return $html;
}
function cacheable ($days='', $printlastmod='yes') {
// Normal use: cacheable();
// Should appear before any normal (non-HTTP-header)
// output.
// cacheable('no') will try it's very best to make
// the page non-cacheable (be putting the
// Expires header in the path)
if ($days == 'no') { $days = -1; }
// Default caching time
if (($days=='') || ($days=='yes')) { $days = 1; }
settype($days, 'double');
setlocale('LC_ALL', 'en_US');
if ($days < 0) {
header('Cache-Control: no-cache, no-store, must-validate');
header('Pragma: no-cache');
header('Last-Modified: now');
header('Expires: '.strftime('%a, %d %b %Y %H:%M:%S GMT',(time() - 86400)));
} else {
// The Last-Modified header may not always be
// relevant, but I believe that it makes the
// pages more cacheable. Default is to put
// it there.
if ($printlastmod == 'yes') {
header('Last-Modified: ' .
strftime('%a, %d %b %Y %H:%M:%S GMT',
getlastmod()));
}
if ($days > 0) {
header('Expires: ' .
strftime('%a, %d %b %Y %H:%M:%S GMT',
(time() + (86400 * $days))));
}
}
}
}
?>
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