Method: Returns an array of all our taxonomy slugs

Method: Used by the save_post_{post_type} hook. Create a term relationship between a post and a term. Inserts the term first if it does not exist.

Method: Adds hooks to register and manage our taxonomies

Method: When the user flips the “Show All Taxonomies” setting switch, this method changes the taxonomy registration so they are shown.

Method: Creates an array that can be set as a query’s tax_query that will exclude sold vehicles.

Method: Outputs HTML that renders a meta box for the colors taxonomy

Method: Registers all our custom taxonomies

Method: Creates HTML output for a meta box that turns a taxonomy into a select drop-down list instead of the typical checkboxes. Including a blank option is the only way a user can remove the value.

Method: An array of taxonomy data used during registration and default term population

Method: Makes sure that taxonomy terms that are numbers are sorted as numbers.