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| <?php |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // // |
| // Copyright (C) 2006 Phorum Development Team // |
| // http://www.phorum.org // |
| // // |
| // This program is free software. You can redistribute it and/or modify // |
| // it under the terms of either the current Phorum License (viewable at // |
| // phorum.org) or the Phorum License that was distributed with this file // |
| // // |
| // This program 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. // |
| // // |
| // You should have received a copy of the Phorum License // |
| // along with this program. // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /* |
| * Simple file-based caching-layer |
| * Recommended are some more sophisticated solutions, like |
| * memcached-, mmcache/eaccelerator-layer |
| */ |
| if(!defined("PHORUM")) return; |
| |
| /* Only load the caching mechanism if we have a cache directory configured. */ |
| if(!isset($PHORUM["cache"])) return; |
| |
| |
| /* initializing our real cache-dir */ |
| $PHORUM['real_cache']=$PHORUM['cache']."/".md5(__FILE__); |
| |
| |
| |
| /* |
| * This function returns the cached data for the given key |
| * or NULL if no data is cached for this key |
| */ |
| function phorum_cache_get($type,$key) { |
| |
| $partpath=$GLOBALS['PHORUM']['real_cache']."/".$type; |
| |
| if(is_array($key)) { |
| $ret=array(); |
| foreach($key as $realkey) { |
| $path=$partpath."/".wordwrap(md5($realkey), PHORUM_CACHE_SPLIT, "/", true)."/data.php"; |
| if(file_exists($path)){ |
| $retval=unserialize(file_get_contents($path)); |
| // the data is: array($ttl_time,$data) |
| if($retval[0] < time()) { // timeout |
| unlink($path); |
| } else { |
| $ret[$realkey]=$retval[1]; |
| } |
| unset($retval); |
| } |
| } |
| } else { |
| $path=$partpath."/".wordwrap(md5($key), PHORUM_CACHE_SPLIT, "/", true)."/data.php"; |
| if(!file_exists($path)){ |
| $ret=NULL; |
| } else { |
| $ret=unserialize(file_get_contents($path)); |
| // the data is: array($ttl_time,$data) |
| if($ret[0] < time()) { // timeout |
| $ret=NULL; |
| unlink($path); |
| } else { |
| $ret=$ret[1]; |
| } |
| } |
| } |
| |
| |
| if(is_array($ret) && count($ret) == 0) { |
| $ret=NULL; |
| } |
| |
| return $ret; |
| |
| } |
| |
| /* |
| * Puts some data into the cache |
| * returns number of bytes written (something 'true') or false ... |
| * depending of the success of the function |
| */ |
| function phorum_cache_put($type,$key,$data,$ttl=PHORUM_CACHE_DEFAULT_TTL) { |
| |
| $path=$GLOBALS['PHORUM']['real_cache']."/$type/".wordwrap(md5($key), PHORUM_CACHE_SPLIT, "/", true); |
| if(!file_exists($path)){ |
| phorum_cache_mkdir($path); |
| } |
| $file=$path."/data.php"; |
| $ttl_time=time()+$ttl; |
| $fp=fopen($file,"w"); |
| $ret=fwrite($fp,serialize(array($ttl_time,$data))); |
| fclose($fp); |
| |
| return $ret; |
| } |
| |
| /* |
| * Removes a key from the cache |
| */ |
| function phorum_cache_remove($type,$key) { |
| |
| $ret =true; |
| $path=$GLOBALS['PHORUM']['real_cache']."/$type/".wordwrap(md5($key), PHORUM_CACHE_SPLIT, "/", true)."/data.php"; |
| if(file_exists($path)) { |
| $ret=unlink($path); |
| } |
| |
| return $ret; |
| } |
| |
| /* |
| * Clears all data from the cache |
| */ |
| function phorum_cache_clear() { |
| $dir = $GLOBALS['PHORUM']['real_cache']; |
| $ret = false; |
| |
| if(!empty($dir) && $dir != "/") { |
| phorum_cache_rmdir($dir); |
| } |
| |
| return $ret; |
| } |
| |
| /* |
| type can be nearly each value to specify a group of data |
| used are currently: |
| 'user' |
| */ |
| |
| // helper functions |
| |
| // recursively deletes all files/dirs in a directory |
| |
| // recursively creates a directory-tree |
| function phorum_cache_mkdir($path) { |
| if(empty($path)) return false; |
| if(is_dir($path)) return true; |
| if (!phorum_cache_mkdir(dirname($path))) return false; |
| mkdir($path); |
| return true; |
| } |
| |
| // recursively deletes all files/dirs in a directory |
| function phorum_cache_rmdir( $path ) { |
| $stack[]=$path; |
| |
| $dirs[]=$path; |
| |
| while(count($stack)){ |
| $path=array_shift($stack); |
| $dir = opendir( $path ) ; |
| while ( $entry = readdir( $dir ) ) { |
| if ( is_file( $path . "/" . $entry ) ) { |
| unlink($path."/".$entry); |
| } elseif ( is_dir( $path . "/" . $entry ) && $entry != '.' && $entry != '..' ) { |
| array_unshift($dirs, $path . "/" . $entry) ; |
| $stack[]=$path . "/" . $entry ; |
| } |
| } |
| closedir( $dir ) ; |
| } |
| foreach($dirs as $dir){ |
| rmdir($dir); |
| } |
| return; |
| } |
| |
| ?> |