WordPress custom post type taxonomy category code example

Example 1: custom post type with taxonomy

//hook into the init action and call create_book_taxonomies when it fires
add_action( 'init', 'create_topics_hierarchical_taxonomy', 0 );
 
//create a custom taxonomy name it topics for your posts
 
function create_topics_hierarchical_taxonomy() {
 
// Add new taxonomy, make it hierarchical like categories
//first do the translations part for GUI
 
  $labels = array(
    'name' => _x( 'Topics', 'taxonomy general name' ),
    'singular_name' => _x( 'Topic', 'taxonomy singular name' ),
    'search_items' =>  __( 'Search Topics' ),
    'all_items' => __( 'All Topics' ),
    'parent_item' => __( 'Parent Topic' ),
    'parent_item_colon' => __( 'Parent Topic:' ),
    'edit_item' => __( 'Edit Topic' ), 
    'update_item' => __( 'Update Topic' ),
    'add_new_item' => __( 'Add New Topic' ),
    'new_item_name' => __( 'New Topic Name' ),
    'menu_name' => __( 'Topics' ),
  );    
 
// Now register the taxonomy
 
  register_taxonomy('topics',array('post'), array(
    'hierarchical' => true,
    'labels' => $labels,
    'show_ui' => true,
    'show_admin_column' => true,
    'query_var' => true,
    'rewrite' => array( 'slug' => 'topic' ),
  ));
 
}

Example 2: get taxonomies for custom post type

// get a list of available taxonomies for a post type
$taxonomies = get_taxonomies(['object_type' => ['your_post_type']])

Example 3: create custom post type with category in wordpress functions.php

function create_posttype() {
  register_post_type( 'wpll_product',
    array(
      'labels' => array(
        'name' => __( 'Products' ),
        'singular_name' => __( 'Product' )
      ),
      'public' => true,
      'has_archive' => true,
      'rewrite' => array('slug' => 'products'),
    )
  );
}
add_action( 'init', 'create_posttype' );

Example 4: wp+create custom post type and category

add_action( 'init', 'create_news' );
function create_news ()
{      
    register_post_type( 'ecommerces',
                array(
                'labels'        => array(
                'name'          => __( 'Ecommerces' ),
                'singular_name' => __( 'Ecommerce' )
                ),
                'public'   => true,
                'supports' => array ('title', 'editor', 'thumbnail')
                )
                );

    register_taxonomy(
                'ecommerce_cat',
                'ecommerces',
                array(
                'labels' => array(
                'name' => 'Ecommerce Categories',
                'add_new_item' => 'Add New Ecommerce Category',
                'new_item_name' => "New Ecommerce Category"
                ),
                'show_ui' => true,
                'show_tagcloud' => false,
                'hierarchical' => true,
                'hasArchive' => true
                )
                );

    }

    if ( function_exists( 'add_theme_support' ) ) {
    add_theme_support( 'post-thumbnails' );
    set_post_thumbnail_size( 100, 100, true ); 
}

    ?>