Crear filtro de imágenes destacadas en biblioteca de medios

    add_filter('media_view_settings', 'featured_image_filter');
    add_action('pre_get_posts', 'create_featured_image_filter', 1);

    function featured_image_filter($settings) {
        $settings['mimeTypes']['wpsefeaturedimage'] = 'Imágenes destacadas';
        return $settings;
    }

    function create_featured_image_filter(\WP_Query $q) {
        if('wpsefeaturedimage' === $q->get('post_mime_type')) {
            $q->set('post_mime_type', '');
            $q->set('wpse_filter_featured', true);

            add_filter('posts_where', function ($where, \WP_Query $q) {
                if($q->get('wpse_filter_featured')) {
                    global $wpdb;
                    $where .= " AND {$wpdb->posts}.ID IN
                        (SELECT DISTINCT m.meta_value FROM {$wpdb->postmeta} m
                          WHERE m.meta_key = '_thumbnail_id'
                        )";
                }
                return $where;
            }, 10, 2 );
        }
    }

// Agregar el filtro al administrador de medios
add_action('restrict_manage_posts', 'featured_image_filter_dropdown');

// Filtrar por imágenes destacadas
function featured_image_filter_dropdown() {
    // Verificar si estamos en la biblioteca de medios
    if ('upload.php' !== $GLOBALS['typenow']) {
        return;
    }

    // Mostrar el dropdown de filtro
    $selected = isset($_GET['featured_image_filter']) ? $_GET['featured_image_filter'] : '';
    $args = array(
        'show_option_all' => 'Todas las imágenes',
        'hide_empty'      => false,
        'hierarchical'    => true,
        'name'            => 'featured_image_filter',
        'id'              => 'featured_image_filter',
        'taxonomy'        => 'post_mime_type',
        'value_field'     => 'slug',
        'selected'        => $selected,
    );

    wp_dropdown_categories($args);
}

// Procesar el filtro
add_filter('parse_query', 'featured_image_filter_query');

function featured_image_filter_query($query) {
    global $pagenow;
   
    // Verificar que estamos en la biblioteca de medios y se ha seleccionado el filtro
    if ('upload.php' == $pagenow && isset($_GET['featured_image_filter']) && $_GET['featured_image_filter'] != 0) {
        $query->set('meta_query', array(
            array(
                'key'     => '_thumbnail_id',
                'compare' => 'EXISTS',
            ),
        ));
    }
}