How do I remove a taxonomy from Wordpress?

Question

I'm creating different custom post types and taxonomies and I want to remove the 'Post Tags' taxonomy from the default 'Posts' post type. How do I go about doing this?

Thanks.

Answer 1

I suggest you don't mess with the actual global. Its safer to simply deregister the taxonomy from the post type: register_taxonomy is used for both creation and modification.

function ev_unregister_taxonomy(){
    register_taxonomy('post_tag', array());
}
add_action('init', 'ev_unregister_taxonomy');

To remove the sidebar menu entry:

// Remove menu
function remove_menus(){
    remove_menu_page('edit-tags.php?taxonomy=post_tag'); // Post tags
}

add_action( 'admin_menu', 'remove_menus' );