7.2. Creating Custom Taxonomies

Now that we’ve discussed what custom taxonomies are and why we’d want to use them, let’s go to the real heart of the matter: creating them and using them to our advantage.

7.2.1. Registering a New Taxonomy

Creating new taxonomies in WordPress is a relatively simple process, and WordPress provides us with a function that accomplishes the job: register_taxonomy(). You should always use the init action hook when calling register_taxonomy(), or else you will incur fatal errors, and nobody likes anything that includes the word “fatal”, do they?