Edited (1)

您需要使用\'child_of\' 从…起WP_Term_Query 可用参数，这将允许您获取当前产品类别的所有子术语parent 期限：

// Only on product category archive pages
if( is_product_category() ) {
    $main_term = get_queried_object();

    $args_query = array(
        \'taxonomy\' => \'product_cat\', 
        \'hide_empty\' => false, 
        \'child_of\' => $main_term->parent
    );

    if ( $main_term->parent != 0 ) {
        // Loop through WP_Term Objects
        foreach ( get_terms( $args_query ) as $term ) {
            if( $term->term_id != $main_term->term_id ) {
                // $term->slug; // Slug

                // Output each (linked) term name…
                echo sprintf( \'<a href="%s">%s</a></br>\', get_term_link( $term->term_id, \'product_cat\' ), $term->name );
            }
        }
    }
}

或者您也可以使用get_term_children() 例如：

// Only on product category archive pages
if( is_product_category() ) {
    $main_term  = get_queried_object();
    $taxonomy   = \'product_cat\';

    if ( $main_term->parent != 0 ) {
        $child_ids = get_term_children( $main_term->parent, $taxonomy );

        echo \'<ul>\';

        foreach ( $child_ids as $child_id ) {
            if( $child_id != $main_term->term_id ) {
                $term = get_term_by( \'id\', $child_id, $taxonomy );
                echo \'<li><a href="\' . get_term_link( $child_id, $taxonomy ) . \'">\' . $term->name . \'</a></li>\';
            }
        }
        echo \'</ul>\';
    }
}

这个is only for product category archive pages, 至于产品页面，您可以为一个产品设置多个产品类别，代码将非常复杂，而且完全不同…