Check whether a category exists.

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

Get comma-separated list of tags available to edit.

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

Check whether a post tag with a given name exists.

Create categories for the given post.

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

Add a new tag to the database if it does not already exist.

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

Updates an existing Category or creates a new Category.