Function: Retrieves a list of category objects.

Function: Retrieves category data given a category ID or category object.

Function: Retrieves a category based on URL containing the category slug.

Function: Retrieves a category object by category slug.

Function: Retrieves the ID of a category from its name.

Function: Retrieves the name of a category from its ID.

Function: Checks if a category is an ancestor of another category.

Function: Sanitizes category data based on context.

Function: Sanitizes data in single category key field.

Function: Retrieves all post tags.