Untitled

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// AUTHOR CUSTOM TAXONOMY
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add_action( 'init', 'register_taxonomy_authors' );

function register_taxonomy_authors() {

    $labels = array(
        'name' => _x( 'Authors', 'authors' ),
        'singular_name' => _x( 'Anthor', 'authors' ),
        'search_items' => _x( 'Search Authors', 'authors' ),
        'popular_items' => _x( 'Popular Authors', 'authors' ),
        'all_items' => _x( 'All Authors', 'authors' ),
        'parent_item' => _x( 'Parent Anthor', 'authors' ),
        'parent_item_colon' => _x( 'Parent Anthor:', 'authors' ),
        'edit_item' => _x( 'Edit Anthor', 'authors' ),
        'update_item' => _x( 'Update Anthor', 'authors' ),
        'add_new_item' => _x( 'Add New Anthor', 'authors' ),
        'new_item_name' => _x( 'New Anthor', 'authors' ),
        'separate_items_with_commas' => _x( 'Separate authors with commas', 'authors' ),
        'add_or_remove_items' => _x( 'Add or remove Authors', 'authors' ),
        'choose_from_most_used' => _x( 'Choose from most used authors', 'authors' ),
        'menu_name' => _x( 'Authors', 'authors' ),
    );

    $args = array(
        'labels' => $labels,
        'public' => true,
        'show_in_nav_menus' => true,
        'show_ui' => true,
        'show_tagcloud' => true,
        'hierarchical' => false,
        'update_count_callback' => '_update_post_term_count',
        'rewrite' => true,
        'query_var' => true
    );

    register_taxonomy( 'authors', array('product'), $args );
}