Kills WordPress execution and displays XML response with an error message.

Adds an additional class to the browser nag if the current version is insecure.

Favorite actions were deprecated in version 3.2. Use the admin bar instead.

Given a meta query, generates SQL clauses to be appended to a main query.

Gets random header image URL from registered images in theme.

Retrieves the screen icon (no longer used in 3.8+).

Retrieves list of WordPress theme features (aka theme tags).

Gets the header images uploaded for the active theme.

Determines whether this site has more than one author.

Checks if random header image is in use.