How To Modify Show UI of a Registered Taxonomy On Demand - wordpress

Question

As you you know the 'show_ui' Boolean option in taking care of rendering or not rending the Taxonomy Menu on UI on registering ataxonomy.
function custom_taxonomy() {
$labels = array(
'name' => 'Taxonomies',
'singular_name' => 'Taxonomy',
'menu_name' => 'Taxonomy',
'all_items' => 'All Items',
'parent_item' => 'Parent Item',
'parent_item_colon' => 'Parent Item:',
'new_item_name' => 'New Item Name',
'add_new_item' => 'Add New Item',
'edit_item' => 'Edit Item',
'update_item' => 'Update Item',
'view_item' => 'View Item',
'separate_items_with_commas' => 'Separate items with commas',
'add_or_remove_items' => 'Add or remove items',
'choose_from_most_used' => 'Choose from the most used',
'popular_items' => 'Popular Items',
'search_items' => 'Search Items',
'not_found' => 'Not Found',
'no_terms' => 'No items',
'items_list' => 'Items list',
'items_list_navigation' => 'Items list navigation',
);
$args = array(
'labels' => $labels,
'hierarchical' => false,
'public' => true,
'show_ui' => true,
'show_admin_column' => true,
'show_in_nav_menus' => true,
'show_tagcloud' => true,
);
register_taxonomy( 'taxonomy', array( 'post' ), $args );
}
add_action( 'init', 'custom_taxonomy', 0 );
Is there any way to modify this option after registering the taxonomy? like any hook or filter to toggle the Boolean in functions.php

Answer 1

You can use register_taxonomy_args to filter the taxonomy options before the taxonomy is registered, or while it's being registered.
Example code:
/*
* #param array $args The taxonomy args such as show_ui.
* #param string $taxonomy The taxonomy name.
*/
add_filter( 'register_taxonomy_args', function ( $args, $taxonomy ) {
if ( 'my_taxonomy' === $taxonomy ) {
$args['show_ui'] = false;
}
return $args;
}, 10, 2 );
There is also an "action" you can "hook" into, where this filter is fired just after a taxonomy is registered. Here, you can, for example, assign other post/object type(s) to the taxonomy.
Example code:
/*
* #param string $taxonomy The taxonomy name.
*/
add_action( 'registered_taxonomy', function ( $taxonomy ) {
if ( 'my_taxonomy' === $taxonomy ) {
register_taxonomy_for_object_type( $taxonomy, 'post' );
}
} );
And if you must (or need to) modify the show_ui (or any other options) of a taxonomy after it's registered, then you can use the global $wp_taxonomies, which is an array of all registered taxonomies.
Example code:
/*
* #param string $taxonomy The taxonomy name.
*/
add_action( 'registered_taxonomy', function ( $taxonomy ) {
if ( 'my_taxonomy' === $taxonomy ) {
global $wp_taxonomies;
if ( ! is_array( $wp_taxonomies )
|| ! isset( $wp_taxonomies[ $taxonomy ] ) ) {
return;
}
$wp_taxonomies[ $taxonomy ]->show_ui = false;
}
} );