PHP Thumb Topic: How does caching work?

PHP Thumb Topic: How does caching work? http://phpthumb.gxdlabs.com/forums/ Help, Suggestions, and General Discussion en Tue, 07 Feb 2012 11:52:02 +0000 Ian on "How does caching work?" http://phpthumb.gxdlabs.com/forums/topic/how-does-caching-work#post-93 Wed, 26 Aug 2009 16:12:51 +0000 Ian 93@http://phpthumb.gxdlabs.com/forums/ Wrong PHP Thumb library my friend :) robbrandt on "How does caching work?" http://phpthumb.gxdlabs.com/forums/topic/how-does-caching-work#post-92 Wed, 26 Aug 2009 15:54:57 +0000 robbrandt 92@http://phpthumb.gxdlabs.com/forums/ It seems that when I update an original file (larger, same location and name) phpthumb continues to display the original file. I have refreshed my browser, even done "view image" to isolate it from the page and refreshed (which usually works in Firefox) but it's still the original. Only when I delete the folders inside of phpThumb/cache/ do the new versions show up. The configuration options seem to suggest that they should be re-caching if the original has changed. The cache settings for phpThumb.config.php are: // * Cache directory configuration (choose only one of these - leave the other lines commented-out): // Note: this directory must be writable (usually chmod 777 is neccesary) for caching to work. // If the directory is not writable no error will be generated but caching will be disabled. $PHPTHUMB_CONFIG['cache_directory'] = dirname(__FILE__).'/cache/'; // set the cache directory relative to the phpThumb() installation //$PHPTHUMB_CONFIG['cache_directory'] = $PHPTHUMB_CONFIG['document_root'].'/phpthumb/cache/'; // set the cache directory to an absolute directory for all source images //$PHPTHUMB_CONFIG['cache_directory'] = './cache/'; // set the cache directory relative to the source image - must start with '.' (will not work to cache URL- or database-sourced images, please use an absolute directory name) //$PHPTHUMB_CONFIG['cache_directory'] = null; // disable thumbnail caching (not recommended) //if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') { // $PHPTHUMB_CONFIG['cache_directory'] = dirname(__FILE__).'/cache/'; // set the cache directory to an absolute directory for all source images //} else { // $PHPTHUMB_CONFIG['cache_directory'] = '/tmp/persistent/phpthumb/cache/'; //} $PHPTHUMB_CONFIG['cache_disable_warning'] = true; // If [cache_directory] is non-existant or not writable, and [cache_disable_warning] is false, an error image will be generated warning to either set the cache directory or disable the warning (to avoid people not knowing about the cache) $PHPTHUMB_CONFIG['cache_directory_depth'] = 4; // If this larger than zero, cache structure will be broken into a broad directory structure based on cache filename. For example "cache_src012345..." will be stored in "/0/01/012/0123/cache_src012345..." when (cache_directory_depth = 4) // * Cache culling: phpThumb can automatically limit the contents of the cache directory // based on last-access date and/or number of files and/or total filesize. //$PHPTHUMB_CONFIG['cache_maxage'] = null; // never delete cached thumbnails based on last-access time $PHPTHUMB_CONFIG['cache_maxage'] = 86400 * 30; // delete cached thumbnails that haven't been accessed in more than [30 days] (value is maximum time since last access in seconds to avoid deletion) //$PHPTHUMB_CONFIG['cache_maxsize'] = null; // never delete cached thumbnails based on byte size of cache directory $PHPTHUMB_CONFIG['cache_maxsize'] = 10 * 1024 * 1024; // delete least-recently-accessed cached thumbnails when more than [10MB] of cached files are present (value is maximum bytesize of all cached files) //$PHPTHUMB_CONFIG['cache_maxfiles'] = null; // never delete cached thumbnails based on number of cached files $PHPTHUMB_CONFIG['cache_maxfiles'] = 200; // delete least-recently-accessed cached thumbnails when more than [200] cached files are present (value is maximum number of cached files to keep) // * Source image cache configuration $PHPTHUMB_CONFIG['cache_source_enabled'] = false; // if true, source images obtained via HTTP are cached to $PHPTHUMB_CONFIG['cache_source_directory'] $PHPTHUMB_CONFIG['cache_source_directory'] = dirname(__FILE__).'/cache/source/'; // set the cache directory for unprocessed source images // * cache source modification date configuration $PHPTHUMB_CONFIG['cache_source_filemtime_ignore_local'] = false; // if true, local source images will not be checked for modification date and cached image will be used if available, even if source image is changed or removed $PHPTHUMB_CONFIG['cache_source_filemtime_ignore_remote'] = true; // if true, remote source images will not be checked for modification date and cached image will be used if available, even if source image is changed or removed. WARNING: cached performance MUCH slower if this is set to false. // * Simplified cache filename configuration // Instead of creating unique cache filenames for all parameter combinations, create "simple" cache files (eg: "pic_thumb.jpg") // If cache_default_only_suffix is non-empty, GETstring parameters (except 'src') are ignored and only $PHPTHUMB_DEFAULTS // parameters (set at the bottom of phpThumb.config.php) are used for processing. // The '*' character MUST be used to represent the source image name $PHPTHUMB_CONFIG['cache_default_only_suffix'] = ''; // cached in normal phpThumb manner //$PHPTHUMB_CONFIG['cache_default_only_suffix'] = '*_thumb'; // cache 'pic.jpg' becomes 'pic_thumb.jpg' (or 'pic_thumb.png' if PNG output is selected, etc) //$PHPTHUMB_CONFIG['cache_default_only_suffix'] = 'small-*'; // cache 'pic.jpg' becomes 'small-pic.jpg' (or 'small-pic.png' if PNG output is selected, etc) $PHPTHUMB_CONFIG['cache_prefix'] = 'phpThumb_cache_'.str_replace('www.', '', @$_SERVER['SERVER_NAME']); //$PHPTHUMB_CONFIG['cache_prefix'] = 'phpThumb_cache'; // allow phpThumb to share 1 set of cached files even if accessed under different servername/domains on same server $PHPTHUMB_CONFIG['cache_force_passthru'] = true; // if true, cached image data will always be passed to browser; if false, HTTP redirect will be used instead