CPT-onomies is a WordPress plugin that allows you to create, and use, taxonomies powered by your custom post types, using the post titles as the taxonomy terms.

CPT-onomies work just like any other taxonomy, allowing you to use WordPress taxonomy functions, like get_terms() and wp_get_object_terms(), to access the information you need. Unfortunately, not every taxonomy function works right now but don’t worry, I’ve created CPT-onomy functions to help bridge the gap between WordPress and the plugin. The CPT-onomy functions even mirror the WordPress functions, using the same parameters and return values.

Use the following documentation to see which WordPress taxonomy functions work (and how to use them) and when you’ll need to use a CPT-onomy function. The documentation also includes function parameters, return values, examples, and other helpful information.