A Wordpress snippet to register a new taxonomy.

wordpress-register-taxonomy.php

<?php

add_action( 'init', 'register_new_taxonomy' );

function register_new_taxonomy() {

  $labels = array(
	'name'					=> _x( 'plural taxonomy', 'Taxonomy general name', 'text_domain' ),
	'singular_name'			=> _x( 'single taxonomy', 'Taxonomy singular name', 'text_domain' ),
	'search_items'			=> __( 'Search plural taxonomy', 'text_domain' ),
	'popular_items'			=> __( 'Popular plural taxonomy', 'text_domain' ),
	'all_items'				=> __( 'All plural taxonomy', 'text_domain' ),
	'parent_item'			=> __( 'Parent single taxonomy', 'text_domain' ),
	'parent_item_colon'		=> __( 'Parent single taxonomy', 'text_domain' ),
	'edit_item'				=> __( 'Edit single taxonomy', 'text_domain' ),
	'update_item'			=> __( 'Update single taxonomy', 'text_domain' ),
	'add_new_item'			=> __( 'Add New single taxonomy', 'text_domain' ),
	'new_item_name'			=> __( 'New single taxonomy Name', 'text_domain' ),
	'add_or_remove_items'	=> __( 'Add or remove plural taxonomy', 'text_domain' ),
	'choose_from_most_used'	=> __( 'Choose from most used plural taxonomy', 'text_domain' ),
	'menu_name'				=> __( 'single taxonomy', 'text_domain' ),
	); 	

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

	register_taxonomy( 'taxonomy-id', array( 'post' ), $args );
}
?>