Add taxonomy filter dropdowns to a CPT admin page.php

// Add taxonomy filter dropdowns to the Resources CPT admin page
function wsv_resources_category_filter() {
    global $typenow;
    if ($typenow == 'resources') {
        $taxonomies = array('resource-type');
        if (!empty($taxonomies)) {
            foreach ($taxonomies as $taxonomy) {
                $selected = isset($_GET[$taxonomy]) ? $_GET[$taxonomy] : '';
                $info_taxonomy = get_taxonomy($taxonomy);
                wp_dropdown_categories(array(
                    'show_option_all' => sprintf(__('Show all %s', 'textdomain'), $info_taxonomy->label),
                    'taxonomy' => $taxonomy,
                    'name' => $taxonomy,
                    'orderby' => 'name',
                    'selected' => $selected,
                    'show_count' => true,
                    'hide_empty' => true,
                ));
            }
        }
    }
}
add_action('restrict_manage_posts', 'wsv_resources_category_filter');

// Filter Resources CPT by selected taxonomy
function wsv_resources_filter_query($query) {
    global $pagenow;
    if ($pagenow == 'edit.php' && isset($_GET['post_type']) && $_GET['post_type'] == 'resources') {
        $taxonomies = array('resource-type');
        foreach ($taxonomies as $taxonomy) {
            if (isset($_GET[$taxonomy]) && $_GET[$taxonomy] != '') {
                $term = get_term_by('slug', $_GET[$taxonomy], $taxonomy);
                if ($term) {
                    $query->query_vars[$taxonomy] = $term->slug;
                }
            }
        }
    }
}
add_filter('parse_query', 'wsv_resources_filter_query');