如果您已在中获得术语对象$data[1] 然后，您只需执行以下操作即可访问父级-

$parent_id = $data[1]->parent;

$term = get_term($data[1], \'product_cat\');
$parent_id = $term->parent;

wp_set_object_terms($product_id, $parent_id, \'product_cat\', true); 

Update: Now your previous category data will not be replaced.