我想更改woocommerce中自定义分类的值。

function get_pw_by_email($email) {

  $products = get_posts(array('post_type' =>'product', 'tax_query' =>array(array('taxonomy' =>'pa_e-mail', 'field' =>'name', 'terms' =>$email))));

  $terms = wp_get_post_terms($products[0] ->ID, 'pa_pw', true);
  
  if (empty($terms)) {
    return '';
  }

  return $terms[0]->name;
}

这样我就可以得到正确的分类值。但是现在我想创建一个随机数并更新该值-而不丢失该产品的所有其他分类。
更新：我能够解决它。

function get_pw_by_email($email) {
    
  $products = get_posts(array('post_type' =>'product', 'tax_query' =>array(array('taxonomy' =>'pa_e-mail', 'field' =>'name', 'terms' =>$email))));
    
  if (empty($products)) {
    return '';
  }
  
    $random_number = rand(10000000, 99999999);

    $attributes = get_post_meta($products[0] ->ID, '_product_attributes', true);

    $terms = wp_get_post_terms($products[0]->ID, 'pa_pw', true);

    if (isset($terms[0]->name)) {
      // pa_pw attribute is already set for the product, set its value
      wp_set_post_terms($products[0] ->ID, $random_number, 'pa_pw', false);
    } else {
      // pa_pw attribute is not set for the product, add it and set its value
      $attributes['pa_pw'] = array('name' => 'pa_pw','value' => null,'is_visible' => '0','is_taxonomy' => '1',);
      update_post_meta($products[0] ->ID, '_product_attributes', $attributes);
      wp_set_post_terms($products[0] ->ID, $random_number, 'pa_pw', false);
    }

    $terms = wp_get_post_terms($products[0]->ID, 'pa_pw', true);
    
  if (empty($terms)) {
    return '';
  }
  
  
  return $terms[0]->name;
}