Introduction to WordPress Taxonomy

Taxonomy makes groups of posts. Taxonomy enables you to a group of the post of similar characteristics.

In WordPress, Mainly two types of taxonomies are used. Both are inbuilt taxonomies.

  • Tags
  • Categories

Categories are Hierarchical Taxonomy, Whenever Tags are Non-Hierarchical Taxonomy.

Custom taxonomy

Many People know that WordPress is a blogging platform, But WordPress provides all facilities that one CMS framework provides. WordPress gives the facility to make custom taxonomy that enhances WordPress as a CMS framework. To make custom taxonomy WordPress has register_taxonomy() function.

<?php register_taxonomy( $taxonomy, $object_type, $args ); ?>

You can refer to this function to the Use init action hook to call this function.


$taxonomy (string) (Required):

The name of taxonomy. Taxonomy should contain only alphanumeric characters and underscore. .All letters should be in lower case. Taxonomy name character length is less than 32 characters.

$object_type (array/string)(required)

The name of the post type for this taxonomy. $object_type can be a built-in post or custom post type. WordPress default post types are post, page, revision, or nav_menu_item. If we want to associate this custom taxonomy $object_type parameter has a custom post type name.

$args (array)(optional)

An array of taxonomy setting array.


label (string)(optional) – The Plural name of this taxonomy.
labels (array)(optional) – An array of labels. For array labels, We consider hierarchical taxonomy as categories and non-hierarchical taxonomy as tags. If labels array is not passed or empty labels array passed, name element of labels array is set to label args element and sigular_name element of labels array is set to taxonomy name.

  • name – Plural name of the taxonomy
  • singular_name – Singular name of the taxonomy.
  • menu_name – The text displayed in the menu. If menu_name is not given, menu_name is to name value.
  • all_items – All Items Text.
  • edit_item – Edit Item Text
  • view_item -View Item Text
  • edit_item – Edit Item text
  • view_item – View Item Label
  • update_item – Update Item Text
  • add_new_item – Add new Item Text
  • new_item_name – New Item Name Label Name
  • parent_item – Parent Item Label. parent_item is only for hierarchical taxonomy. Default is Parent Category
  • parent_item_colon -same as parent item but with colon, default is same as parent_item.
  • search_item -search Item Text
  • popular items – Popular Items Text

There are other argument elements. You can refer them to the

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Prashant Baldha