WP: Manually Creating Custom Taxonomies - Tags

To create a non-hierarchical custom taxonomy like Tags, add this code in your theme’s functions.php or in a site-specific plugin:

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//hook into the init action and call create_topics_nonhierarchical_taxonomy when it fires

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

function create_topics_nonhierarchical_taxonomy() {

// Labels part for the GUI

  $labels = array(
    'name' => _x( 'Topics', 'taxonomy general name' ),
    'singular_name' => _x( 'Topic', 'taxonomy singular name' ),
    'search_items' =>  __( 'Search Topics' ),
    'popular_items' => __( 'Popular Topics' ),
    'all_items' => __( 'All Topics' ),
    'parent_item' => null,
    'parent_item_colon' => null,
    'edit_item' => __( 'Edit Topic' ),
    'update_item' => __( 'Update Topic' ),
    'add_new_item' => __( 'Add New Topic' ),
    'new_item_name' => __( 'New Topic Name' ),
    'separate_items_with_commas' => __( 'Separate topics with commas' ),
    'add_or_remove_items' => __( 'Add or remove topics' ),
    'choose_from_most_used' => __( 'Choose from the most used topics' ),
    'menu_name' => __( 'Topics' ),
  );

// Now register the non-hierarchical taxonomy like tag

  register_taxonomy('topics','post',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' => 'topic' ),
  ));
}

Kode menampilkan di web, masukkan ke single.php:
<?php the_terms( $post->ID, 'topics', 'Topics: ', ', ', ' ' ); ?>

kunci: http://www.wpbeginner.com/wp-tutorials/create-custom-taxonomies-wordpress/

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INI YANG BISA
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//create a function that will attach our new 'penulis' taxonomy to the 'post' post type

function add_penulis_taxonomy_to_post(){

    //set the name of the taxonomy
    $taxonomy = 'penulis';
    //set the post types for the taxonomy
    $object_type = 'post';

    //populate our array of names for our taxonomy
    $labels = array(
        'name'               => 'penulis',
        'singular_name'      => 'penulis',
        'search_items'       => 'Search penulis',
        'all_items'          => 'All penulis',
        'parent_item'        => 'Parent penulis',
        'parent_item_colon'  => 'Parent penulis:',
        'update_item'        => 'Update penulis',
        'edit_item'          => 'Edit penulis',
        'add_new_item'       => 'Add New penulis',
        'new_item_name'      => 'New penulis Name',
        'menu_name'          => 'penulis'
    );

    //define arguments to be used
    $args = array(
        'labels'            => $labels,
        'hierarchical'      => false,
        'show_ui'           => true,
        'how_in_nav_menus'  => true,
        'public'            => true,
        'show_admin_column' => true,
        'query_var'         => true,
        'rewrite'           => array('slug' => 'penulis')
    );

    //call the register_taxonomy function
    register_taxonomy($taxonomy, $object_type, $args);
}
add_action('init','add_penulis_taxonomy_to_post');

Kode menampilkan di web, masukkan ke single.php:
<?php the_terms( $post->ID, 'topics', 'Topics: ', ', ', ' ' ); ?>

DIambil dar: https://generatewp.com/taxonomy/