Add Taxonomies

You can add new and existing taxonomies to a post type by passing the taxonomy name to the taxonomy() method.

// Create a book post type.
$books = new PostType( 'book' );
// Add the genre taxonomy to the book post type.
$books->taxonomy( 'genre' );
// Add the default category taxonomy.
$books->taxonomy( 'category' );
// Register the post type to WordPress.
$books->register();

This method only attaches the taxonomy to the post type, to create a taxonomy see the documentation on creating a new taxonomy.

Taxonomies and post types can be created in any order.