试试这个，它对我有用。将此代码放在主题函数中。php文件。

function dynamic_product_category_widget($title, $widet_instance, $widget_id) {

    if ( $widget_id !== \'woocommerce_product_categories\' )
        return $title;

    if ( is_product_category() ) {
        $cat_title = single_cat_title(\'<p class="widget-title footer-widget">\', \'</p>\');
        return $cat_title;
    } elseif ( is_product() ) {
        $cat = get_the_terms( $product->ID, \'product_cat\' );

        foreach ($cat as $categoria) {
            if($categoria->parent == 0){
                $topCategory = $categoria;
            }
        }
        return \'<p class="widget-title footer-widget">\'.$topCategory->name.\'</p>\';
    }
    
    return $title;
}
add_filter ( \'widget_title\' , \'dynamic_product_category_widget\', 10, 3);