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//CREATE CUSTOM POST TYPE WITH CUSTOM TAXOMIES


function my_custom_post_product() {
  $labels = array(
    'name'               => _x( 'Products', 'post type general name' ),
    'singular_name'      => _x( 'Product', 'post type singular name' ),
    'add_new'            => _x( 'Add New', 'book' ),
    'add_new_item'       => __( 'Add New Product' ),
    'edit_item'          => __( 'Edit Product' ),
    'new_item'           => __( 'New Product' ),
    'all_items'          => __( 'All Products' ),
    'view_item'          => __( 'View Product' ),
    'search_items'       => __( 'Search Products' ),
    'not_found'          => __( 'No products found' ),
    'not_found_in_trash' => __( 'No products found in the Trash' ), 
    'parent_item_colon'  => '',
    'menu_name'          => 'Products'
  );
  $args = array(
    'labels'        => $labels,
    'description'   => 'Holds our products and product specific data',
    'public'        => true,
    'menu_position' => 5,
    'supports'      => array( 'title', 'editor', 'thumbnail', 'excerpt', 'comments' ),
    'has_archive'   => true,
  );
  register_post_type( 'product', $args ); 
}
add_action( 'init', 'my_custom_post_product' );


function my_taxonomies_product() {
  $labels = array(
    'name'              => _x( 'Product Categories', 'taxonomy general name' ),
    'singular_name'     => _x( 'Product Category', 'taxonomy singular name' ),
    'search_items'      => __( 'Search Product Categories' ),
    'all_items'         => __( 'All Product Categories' ),
    'parent_item'       => __( 'Parent Product Category' ),
    'parent_item_colon' => __( 'Parent Product Category:' ),
    'edit_item'         => __( 'Edit Product Category' ), 
    'update_item'       => __( 'Update Product Category' ),
    'add_new_item'      => __( 'Add New Product Category' ),
    'new_item_name'     => __( 'New Product Category' ),
    'menu_name'         => __( 'Product Categories' ),
  );
  $args = array(
    'labels' => $labels,
    'hierarchical' => true,
  );
  register_taxonomy( 'product_category', 'product', $args );
}
add_action( 'init', 'my_taxonomies_product', 0 );





GET ALL TAXOMIES


<?php 

$categories = get_terms( 'product_category', 'orderby=count&hide_empty=0' );

foreach ($categories as $cat) { ?>
	<a href="<?= get_category_link( $cat->term_id); ?> "><?= $cat->name; ?></a>
<?php }

var_dump($categories);