Quick and easy function to check if a plugin/theme/whatever has add/registered a shortcode in WordPress: Just add this into your plugin or theme’s functions.php and wherever you need to check if the shortcode exists, just call is_shortcode_defined(“button”); or something similar from an if statement, as such: Hope this helps.
WordPress
WordPress loops, latests posts, sticky posts and problems
I just figured out a problem (or just a nuisance?) of WordPress 3.0.1 that was driving me crazy, but finally got it working as expected. To all you WordPress theme developers out there, I hope the following explanation of the problem and the solution will save you a few minutes or hours of head-scratching.