WordPress.org

How to uninstall WP Super Cache

Almost all you have to do is deactivate the plugin on the plugins page. The plugin should clean up most of the files it created and modified, but it doesn't as yet remove the mod_rewrite rules from the .htaccess file. Look for the section in that file marked by SuperCache BEGIN and END tags. The plugin doesn't remove those because some people add the WordPress rules in that block too.

To manually uninstall:

1. Turn off caching on the plugin settings page and clear the cache.
2. Deactivate the plugin on the plugins page.
3. Remove the WP_CACHE define from wp-config.php. It looks like define( 'WP_CACHE', true );
4. Remove the Super Cache mod_rewrite rules from your .htaccess file.
5. Remove the files wp-content/advanced-cache.php and wp-content/wp-cache-config.php
6. Remove the directory wp-content/cache/
7. Remove the directory wp-super-cache from your plugins directory.

If all else fails and your site is broken

1. Remove the WP_CACHE define from wp-config.php. It looks like define( 'WP_CACHE', true );
2. Remove the rules (see above) that the plugin wrote to the .htaccess file in your root directory.
3. Delete the wp-super-cache folder in the plugins folder.
4. Optionally delete advanced-cache.php, wp-cache-config.php and the cache folder in wp-content/.

CDN

A Content Delivery Network (CDN) is usually a network of computers situated around the world that will serve the content of your website faster by using servers close to you. Static files like images, Javascript and CSS files can be served through these networks to speed up how fast your site loads. You can also create a "poor man's CDN" by using a sub domain of your domain to serve static files too.

OSSDL CDN off-linker has been integrated into WP Super Cache to provide basic CDN support. It works by rewriting the URLs of files (excluding .php files) in wp-content and wp-includes on your server so they point at a different hostname. Many CDNs support origin pull. This means the CDN will download the file automatically from your server when it's first requested, and will continue to serve it for a configurable length of time before downloading it again from your server.

Configure this on the "CDN" tab of the plugin settings page. This is an advanced technique and requires a basic understanding of how your webserver or CDNs work. Please be sure to clear the file cache after you configure the CDN.

Custom Caching

It is now possible to hook into the caching process using the add_cacheaction() function.

Three hooks are available:

1. 'wp_cache_get_cookies_values' - modify the key used by WP Cache.
2. 'add_cacheaction' - runs in phase2. Allows a plugin to add WordPress hooks.
3. 'cache_admin_page' - runs in the admin page. Use it to modify that page, perhaps by adding new configuration options.

There is one regular WordPress filter too. Use the "do_createsupercache" filter to customize the checks made before caching. The filter accepts one parameter. The output of WP-Cache's wp_cache_get_cookies_values() function.

See plugins/searchengine.php as an example I use for my No Adverts for Friends plugin.

Links

WP Widget Cache is another caching plugin for WordPress. This plugin caches the output of widgets and may significantly speed up dynamic page generation times.

Updates

Updates to the plugin will be posted here, to Holy Shmoly! and the WP Super Cache homepage will always link to the newest version.

Thanks

I would sincerely like to thank John Pozadzides for giving me the idea for this, for writing the "How it works" section and for testing the plugin through 2 front page appearances on digg.com

Thanks to James Farmer and Andrew Billits of Edu Blogs fame who helped me make this more WordPress MU friendly.

Translators who did a great job converting the text of the plugin to their native language. Thank you!

• Gianni Diurno (Italian)
• Omi (Spanish)
• tomchen1989 (Simplified Chinese)
• Tai (Japanese)
• Vitaly (Ukranian)
• Pseric and Priv (Traditional Chinese)
• Maître Mô (French)
• Mathias Roth (German)
• Bar¿¿ Ünver (Turkish)
• Elvis Fweb (Russian)
• Fredrik Forséll (Swedish)
• Alyona Lompar (Ukranian)
• Nata Strazda (Lithuanian)
• Alexander Alexandrov (Belarusian)
• Michail Bogdanov (Romanian)