WordPress Register Custom Taxonomy

To register a custom taxonomy in WordPress, you can use the register_taxonomy() function. This allows you to create a new taxonomy, such as a category or tag-like classification, for your custom post types. Here’s an example of how you can register a custom taxonomy:

function wpsnippets_register_custom_taxonomy() {
    $labels = array(
        'name'                       => _x( 'Custom Taxonomy', 'taxonomy general name', 'text-domain' ),
        'singular_name'              => _x( 'Custom Taxonomy', 'taxonomy singular name', 'text-domain' ),
        'search_items'               => __( 'Search Custom Taxonomy', 'text-domain' ),
        'popular_items'              => __( 'Popular Custom Taxonomy', 'text-domain' ),
        'all_items'                  => __( 'All Custom Taxonomy', 'text-domain' ),
        'edit_item'                  => __( 'Edit Custom Taxonomy', 'text-domain' ),
        'update_item'                => __( 'Update Custom Taxonomy', 'text-domain' ),
        'add_new_item'               => __( 'Add New Custom Taxonomy', 'text-domain' ),
        'new_item_name'              => __( 'New Custom Taxonomy Name', 'text-domain' ),
        'separate_items_with_commas' => __( 'Separate items with commas', 'text-domain' ),
        'add_or_remove_items'        => __( 'Add or remove items', 'text-domain' ),
        'choose_from_most_used'      => __( 'Choose from the most used', 'text-domain' ),
        'not_found'                  => __( 'No custom taxonomy found', 'text-domain' ),
        'menu_name'                  => __( 'Custom Taxonomy', 'text-domain' ),
    );

    $args = array(
        'labels'                     => $labels,
        'public'                     => true,
        'hierarchical'               => true, // Change to false if non-hierarchical
        'show_ui'                    => true,
        'show_admin_column'          => true,
        'show_in_nav_menus'          => true,
        'show_tagcloud'              => true,
    );

    register_taxonomy( 'custom_taxonomy', array( 'post' ), $args );
}

add_action( 'init', 'wpsnippets_register_custom_taxonomy', 0 );

In this example, the custom taxonomy is named “Custom Taxonomy”. You can customize the taxonomy labels and settings according to your needs.

Inside the wpsnippets_register_custom_taxonomy() function, the $labels array defines the labels for the taxonomy. Adjust the labels as desired. The $args array contains the configuration options for the taxonomy itself. You can modify the options such as public, hierarchical, and others to suit your requirements. The register_taxonomy() function is called with the taxonomy slug (custom_taxonomy), the post types to which the taxonomy is applicable (in this case, ‘post’), and the $args array.

By adding this code snippet to your site, you can register a custom taxonomy in WordPress, and you can associate it with your custom post types or use it for standard posts.