Function: Add a new term to the database if it does not already exist.

Function: Get comma-separated list of terms available to edit for the given post ID.

Function: Check whether a category exists.

Function: Get category object for given ID and ‘edit’ filter context.

Function: Add a new category to the database if it does not already exist.

Function: Create categories for the given post.

Function: Aliases wp_insert_category() with minimal args.

Function: Check whether a post tag with a given name exists.