WP - register taxonomy

register taxonomy (wp)

<?php
// hook into the init action and call create_my_taxonomies when it fires
add_action( 'init', 'create_my_taxonomies', 0 );

// create two taxonomies, hierarchival_group and liner_groups for the post type "my"
function create_my_taxonomies() {
	
	// ------------ Hierarchical ------------
	// Add new taxonomy, make it hierarchical (like categories)
	$labels = array(
		'name'              => _x( 'hierarchical_groups', 'taxonomy general name' ),
		'singular_name'     => _x( 'hierarchical_group', 'taxonomy singular name' ),
		'search_items'      => __( 'Search hierarchical_groups' ),
		'all_items'         => __( 'All hierarchical_groups' ),
		'parent_item'       => __( 'Parent hierarchical_group' ),
		'parent_item_colon' => __( 'Parent hierarchical_group:' ),
		'edit_item'         => __( 'Edit hierarchical_group' ),
		'update_item'       => __( 'Update hierarchical_group' ),
		'add_new_item'      => __( 'Add New hierarchical_group' ),
		'new_item_name'     => __( 'New hierarchical_group Name' ),
		'menu_name'         => __( 'hierarchical_group' ),
	);

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

	register_taxonomy( 'hierarchical_group', array( 'my' ), $args );

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

	$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' => 'liner_group' ),
	);

	register_taxonomy( 'liner_group', 'my', $args );
}