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<?php
#############################################################################################
# � 2005 Hans Feijoo - [email protected] #
# Free for you to use and abuse, it'd be nice if you did not remove this tag and mention #
# me in any derivative work, but you don't have to. #
# #
# Cacheton - An utility to cache pages that frequently query a db which is not updated #
# so frequently #
# #
# Requirements: Not much, PHP 4.1.0+, 5 and a cache directory with the proper permissions #
# Usage: You must create a directory to store cached pages, (CACHE_DIR) with the proper #
# permisions (755). Name it 'cache'. (path/to/this/file/cache/) #
# Include this file at the top of your script. #
# include('path/to/this/file/cacheton.php'); #
# That's it! #
# Comments: Default life of cache files is 300 seconds, you can change this by setting #
# $cache_life before including this script or setting that value below. #
# $cache_life = 60*60*24*30 //1 month! (in seconds) #
# include('cacheton.php'); #
# #
# I'd suggest renaming cacheton.php. Files will be served even if not caching, so make sure #
# cached files exist, if they don't, then THIS script is not working, usually that means a #
# permission issue with your cache directory. #
# If you want to know if files are actually being cached and the time they were, #
# take a look at your served pages source code, at the end, there should be a comment with #
# the actual caching time. #
# If you need to manually clean cache files, add the argument 'flushcache', #
# ie: myscript.php?arg1=foo&flushcache or cacheton.php?flushcache #
# Keep in mind that ALL files in cache dir will be deleted if parameter olderthan is not #
# specified. You can call it directly from this script: #
# cacheton.php?flushcache&olderthan=3000 (in seconds) #
# parameter olderthan is self-explanatory, if not specified, all files will be deleted #
# You can prevent the caching if for instance there�s a database error or empty result, #
# your db was unavailable for a certain time, you don�t want to cache 'not found' files, etc#
# to prevent caching just set '$GLOBALS['nocache'] = true' anywhere in YOUR script #
# It is safe to use the same cache dir and this same script across different applications. #
# Just remember that when you clean cache, you clean it for all. If that�s not what you want#
# you can create multiple instances of this script along with its own cache dir. #
# #
# This should be obvious but DO NOT use this script if the http request method is POST. #
# I'd love to hear your feedback and suggestions. #
# #
# Enjoy it, your database will thank you. You can reduce server load up to 50% #
#############################################################################################
# Last Modified 05.03.2006 #
#############################################################################################
//You shouldn't need to change anything, just remember to create cache dir as a subdirectory of the directory where
//this file is, with the appropiate permissions 0755 should work, if not, try 0777
//ob_start("ob_gzhandler"); //Uncomment this if you want your output to be compressed
define('CACHE_DIR', dirname(__FILE__).'/cache/');
$nocache = false;
$period = (!empty($cache_life) && is_numeric($cache_life)) ? round($cache_life) : 300; //cache file life in seconds
$cache_file = CACHE_DIR.md5($_SERVER['REQUEST_URI']);
#################################################################################
# Delete files older than cache life, comment this if not autoclean desired, #
# you�ll have to clean using "flushcache", but may reduce disk and CPU load #
# since it will not be done every time a script is called #
autoclean($period);
#################################################################################
if (!function_exists('file_put_contents')) {
function file_put_contents($filename, $content) {
if ($fhandler = fopen($filename, 'w')) {
$result = fwrite($fhandler, $content);
fclose($fhandler);
return $result;
}
return false;
}
}
function update($content) {
$content = ob_get_contents();
if ($GLOBALS['nocache'] !== true) { //remove ".'<!-- Cached: '.date('Ymd H:i:s').' -->'" if you don�t want it in your html source code
file_put_contents($GLOBALS['cache_file'], $content.'<!-- Cached: '.date('Ymd H:i:s').' -->');
}
return $content;
}
function autoclean($age) {
if (is_dir(CACHE_DIR)) {
if ($dh = opendir(CACHE_DIR)) {
while (($file = readdir($dh)) !== false) {
if (is_file(CACHE_DIR . $file) && (time()-filemtime(CACHE_DIR.$file))>= $age) {
unlink(CACHE_DIR . $file);
}
}
}
closedir($dh);
}
}
if (isset($_REQUEST['flushcache'])) {
if (is_dir(CACHE_DIR)) {
if ($dh = opendir(CACHE_DIR)) {
if(!empty($_REQUEST['olderthan']) && is_numeric($_REQUEST['olderthan'])){
$tcache = floor($_REQUEST['olderthan']);
while (($file = readdir($dh)) !== false) {
if (is_file(CACHE_DIR . $file) && (time()-filemtime(CACHE_DIR.$file))>= $tcache) {
unlink(CACHE_DIR . $file);
}
}
}
else {
while (($file = readdir($dh)) !== false) {
if (is_file(CACHE_DIR . $file)) {
unlink(CACHE_DIR . $file);
}
}
}
closedir($dh);
}
}
}
if (file_exists($cache_file)){
if((time() - filemtime($cache_file))>= $period) {
ob_start('update');
}
else {
$content = file_get_contents($cache_file);
echo $content;
exit;
}
}
else{
ob_start('update');
}
?>
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