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No, not really. This wouldn't be a plugin since every theme is different. Some themes have this functionality built in, though.

EDIT I should add that in order for a file to be checked for headers, it must be a .php file either in the plugins directory or in a subdirectory of the plugins directory. … So, for example, wp-content/plugins/plugin.php and wp-content/plugins/my-plugin/plugin.php would be valid, but wp-content/plugins/my-plugin/lib/file.php would not. …

The only way to have a distributed plugin that has a secure license which any halfway decent programmer can't hack is to run the plugin's main functionality on your own server, like Akismet. The user …

The first thing you should do is set up a development version of your website that you can break with impunity. Then just try upgrading it. If it works, great! If not, it may be just small changes tha …

Your arguments here */ ); } add_action( 'wp_loaded', 'self_deprecating_sidebar_registration' ); Most themes will register the sidebar in their functions file, which is included before init but after plugins …

No, you shouldn't need one each way. You can query on either direction of the one connection, so something like this would get you all actors in Dark Knight: $actors = new WP_Query( array( 'post_t …

No it doesn't. At least, not on the front end, or in the back end in any non-plugin area. WordPress only loads files whose filepaths are stored in the active_plugins option in the database and ignores …

I always include a .htaccess file in wp-admin, even if I never put anything in it, since it negates the root directory's file. Some people use the wp-admin .htaccess file to hide the whole directory f …

I don't see any reason not to make WordPress into a bug tracker. Essentially, tickets would be a non-hierarchical custom post type which would have several taxonomies, such as priority, status, etc.

Plugins in WordPress do what the code says. To answer specifically to your questions, They shouldn't, but there's nothing stopping them from modifying core files. …

There's this plugin: http://wordpress.org/extend/plugins/wp-bitly/ …

Justin Tadlock's Members plugin works on multisite: http://wordpress.org/extend/plugins/members/ …

The solution at that page is fine. The reason it's generating unexpected output is because you might have accidentally grabbed trailing whitespace when pasting it. If you use this instead: <?php /* P …

I would not give them control over the actual name of the post type. What if they rename it to revision or attachment? Big time site wreckage potential there. I'd say stick with the more "trivial" th …

Go into wp-config.php and change define('WP_DEBUG', false); to define('WP_DEBUG', true);. Also, install Andrew Nacin's Log Deprecated Notices plugin.