Add/overwrite a parameter on an existing post type/taxonomy

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I have several sites with custom post types and taxonomies registered by different plugins. Is there a way to add or change a parameter like this: 

'rewrite' => array( 'hierarchical' => true )

by adding something to functions.php—without completely re-registering the type/taxonomy? I want to continue to use certain plugins to manage types and taxonomies, but not all parameters are provided.

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3 comments

  1. you could modify the global variable $wp_post_types or in the case of taxonomies, $wp_taxonomies

    for example, this will change the menu name and all the labels for the default Posts to Bacon:

    function change_post_menu_label() {
    global $menu;
    global $submenu;
    $menu[5][0] = 'Bacon';
    $submenu['edit.php'][5][0] = 'Bacon';
    $submenu['edit.php'][10][0] = 'Add Bacon';
    $submenu['edit.php'][16][0] = 'Bacon Tags';
    echo '';
}
function change_post_object_label() {
    global $wp_post_types;
    $labels = &$wp_post_types['post']->labels;
    $labels->name = 'Bacon';
    $labels->singular_name = 'Bacon';
    $labels->add_new = 'Add Bacon';
    $labels->add_new_item = 'Add Bacon';
    $labels->edit_item = 'Edit Bacon';
    $labels->new_item = 'Bacon';
    $labels->view_item = 'View Bacon';
    $labels->search_items = 'Search Bacon';
    $labels->not_found = 'No Bacon found';
    $labels->not_found_in_trash = 'No Bacon found in Trash';
}
add_action( 'init', 'change_post_object_label' );
add_action( 'admin_menu', 'change_post_menu_label' );

    source:
    http://new2wp.com/snippet/change-wordpress-posts-post-type-news/

  2. WordPress has multiple functions that allow for the type of thing you’re trying to do.

    Check out:

    • add_post_type_support()
    • remove_post_type_support()
    • register_taxonomy_for_object_type()

    If you want to remove a taxonomy, you have to reregister it—using register_taxonomy()—and then omit the post type(s) you don’t want from the $object_type argument’s array. Then, make sure you’re hooking to function to a hook that runs after it’s first registered (or on the same hook but at a lower priority).

    p.s. Sorry I couldn’t link to all these (not enough reputation points). All those functions have entries in the codex; just google them.

  3. Since WordPress 4.4 there is a hook that you can use for that use-case, it is called register_taxonomy_args.

    It lets you modify the arguments of a taxonomy before it is actually registered and it works even for the internal taxonomies.

    Here is an example which sets the ‘category’ taxonomy urls to hierarchical:

    function NAMESPACE_register_taxonomy_args( $args, $taxonomy ) {
  if ( $taxonomy === 'category' ) {
    $args['rewrite']['hierarchical'] = true;
  }
  return $args;
}
add_filter( 'register_taxonomy_args', 'NAMESPACE_register_taxonomy_args', 10, 2 );