<?php
function create_book_taxonomies() {
    // Add new taxonomy, make it hierarchical (like categories)
    $labels = array(
        \'name\'              => _x( \'Genres\', \'taxonomy general name\', \'textdomain\' ),
        \'singular_name\'     => _x( \'Genre\', \'taxonomy singular name\', \'textdomain\' ),
        \'search_items\'      => __( \'Search Genres\', \'textdomain\' ),
        \'all_items\'         => __( \'All Genres\', \'textdomain\' ),
        \'parent_item\'       => __( \'Parent Genre\', \'textdomain\' ),
        \'parent_item_colon\' => __( \'Parent Genre:\', \'textdomain\' ),
        \'edit_item\'         => __( \'Edit Genre\', \'textdomain\' ),
        \'update_item\'       => __( \'Update Genre\', \'textdomain\' ),
        \'add_new_item\'      => __( \'Add New Genre\', \'textdomain\' ),
        \'new_item_name\'     => __( \'New Genre Name\', \'textdomain\' ),
        \'menu_name\'         => __( \'Genre\', \'textdomain\' ),
    );

    $args = array(
        \'hierarchical\'      => true,
        \'labels\'            => $labels,
        \'show_ui\'           => true,
        \'show_admin_column\' => true,
        \'query_var\'         => true,
        \'rewrite\'           => array( \'slug\' => \'genre\' ),
    );

    register_taxonomy( \'genre\', array( \'book\' ), $args );

    // Add new taxonomy, NOT hierarchical (like tags)
    $labels = array(
        \'name\'                       => _x( \'Writers\', \'taxonomy general name\', \'textdomain\' ),
        \'singular_name\'              => _x( \'Writer\', \'taxonomy singular name\', \'textdomain\' ),
        \'search_items\'               => __( \'Search Writers\', \'textdomain\' ),
        \'popular_items\'              => __( \'Popular Writers\', \'textdomain\' ),
        \'all_items\'                  => __( \'All Writers\', \'textdomain\' ),
        \'parent_item\'                => null,
        \'parent_item_colon\'          => null,
        \'edit_item\'                  => __( \'Edit Writer\', \'textdomain\' ),
        \'update_item\'                => __( \'Update Writer\', \'textdomain\' ),
        \'add_new_item\'               => __( \'Add New Writer\', \'textdomain\' ),
        \'new_item_name\'              => __( \'New Writer Name\', \'textdomain\' ),
        \'separate_items_with_commas\' => __( \'Separate writers with commas\', \'textdomain\' ),
        \'add_or_remove_items\'        => __( \'Add or remove writers\', \'textdomain\' ),
        \'choose_from_most_used\'      => __( \'Choose from the most used writers\', \'textdomain\' ),
        \'not_found\'                  => __( \'No writers found.\', \'textdomain\' ),
        \'menu_name\'                  => __( \'Writers\', \'textdomain\' ),
    );

    $args = array(
        \'hierarchical\'          => false,
        \'labels\'                => $labels,
        \'show_ui\'               => true,
        \'show_admin_column\'     => true,
        \'update_count_callback\' => \'_update_post_term_count\',
        \'query_var\'             => true,
        \'rewrite\'               => array( \'slug\' => \'writer\' ),
    );

    register_taxonomy( \'writer\', \'book\', $args );
}