How to prohibit the removal of taxomy?

Question

WordPress

Hello, tell me how you can disable the removal of taxonomy, is it possible to do this

Answer 1

add_action( 'delete_term_taxonomy', 'wpse_70758_del_tax', 10, 1 );
add_action( 'edit_term_taxonomies', 'wpse_70758_del_child_tax', 10, 1 );

$undeletable = array( 'категория_один', 'категория_два' );		// <<<<<<<<<< сюда вписывать категории, которые нельзя удалить (category slugs)

function wpse_70758_del_tax( $tt_id )
{
    global $undeletable;
    $term = get_term_by( 'id', $tt_id, 'category' );
    if( in_array( $term->slug, $undeletable ) ) 
        wp_die( 'Required category, can not be delete.' );
}
function wpse_70758_del_child_tax( $arr_ids )
{
    global $undeletable;
    foreach( $arr_ids as $id )
    {
        $term   = get_term_by( 'id', $id, 'category' );
        $parent = get_term_by( 'id', $term->parent, 'category' );
        if( in_array( $parent->slug, $undeletable ) ) 
            wp_die( 'Required category, can not be delete.' );        
    }
}

Optionally adapt to the desired taxonomy.
True, this is a bit of a crutch. But it will not be possible to delete after such protection.