Personalización de taxonomía y slug en tipos de publicaciones personalizadas

// rewrite urlsfunction taxonomy_slug_rewrite($wp_rewrite) {    $rules = array();    $taxonomies = get_taxonomies(array('_builtin' => false), 'objects');    $post_types = get_post_types(array('public' => true, '_builtin' => false), 'names');    foreach ($post_types as $post_type) {    foreach ($taxonomies as $taxonomy) {        if ($taxonomy->object_type[0] == $post_type) {        $categories = get_categories(array('type' => $post_type, 'taxonomy' => $taxonomy->name, 'hide_empty' => 0));        foreach ($categories as $category) {            $rules[$post_type . '/' . $category->slug . '/?$'] = 'index.php?' . $category->taxonomy . '=' . $category->slug;        }        }    }    }    $wp_rewrite->rules = $rules + $wp_rewrite->rules;}add_filter( 'generate_rewrite_rules', 'taxonomy_slug_rewrite' );

// register Custom Post Typesfunction create_post_types() {
    register_post_type('projects', array(        'labels' => array(        'name' => 'Projects',        'all_items' => 'All Projects'    ),        'public' => true,        'has_archive' => true,    'rewrite' => array('slug' => 'projects'),    'supports' => array('title', 'editor', 'thumbnail', 'excerpt'),    'exclude_from_search' => false    ));
}add_action('init', 'create_post_types');

// register Taxonomiesfunction create_taxonomies() {
    register_taxonomy('project-categories', array('projects'), array(    'labels' => array(        'name' => 'Project Categories'    ),        'show_ui' => true,        'show_tagcloud' => false,        'hierarchical' => true,        'rewrite' => array(        'slug' => 'projects'    )    ));
}add_action('init', 'create_taxonomies');