扩展WordPress和WooCommerce的最佳方法是使用hooks. 要在“产品”区域中添加自定义选项字段，可以使用以下挂钩：

• woocommerce_product_options_advanced: 用于在“高级”选项卡中添加自定义字段woocommerce_process_product_meta: 用于在计算机上保存/更新数据库中的字段数据functions.php, 您可以添加以下代码：

  /* create a new product field*/
  add_action( \'woocommerce_product_options_advanced\', \'personalization_product_options_adv\' );
  function personalization_product_options_adv() {
      echo \'<div class="options_group">\';
  
      woocommerce_wp_textarea_input( array( 
          \'id\' => \'product_personalization_note\',
          \'value\' => get_post_meta( get_the_ID(), \'product_personalization_note\', true ),
          \'label\' => \'Personalization Note\',
          \'desc_tip\' => true,
          \'description\' => \'Allow product personalization for select products\',
      ) );
  
      echo \'</div>\';
  }
  
  /* save & update the changes*/
  add_action( "woocommerce_process_product_meta", "personalization_save_fields" );
  function personalization_save_fields( $post_id ) {
      // grab the custom data from $_POST
      $product_personalization_note = isset( $_POST[ \'product_personalization_note\' ] ) ? sanitize_text_field( $_POST[ \'product_personalization_note\' ] ) : \'\';
  
      // grab the product
      $product = wc_get_product( $post_id );
  
      // save the custom data using WooCommerce built-in functions
      $product->update_meta_data( \'product_personalization_note\', $product_personalization_note );
  
      //save
      $product->save();
  }
  
  /* display the new field on single product pages */
  function woocommerce_custom_fields_display() {
    global $post;
    $product = wc_get_product($post->ID);
      $custom_fields_woocommerce_title = $product->get_meta(\'product_personalization_note\');
    if ($custom_fields_woocommerce_title) {
        printf(
              \'<div><label>%s</label><input type="text" id="woocommerce_product_custom_fields_title" name="woocommerce_product_custom_fields_title" value=""></div>\',
              esc_html($custom_fields_woocommerce_title)
        );
    }
  }
  add_action(\'woocommerce_before_add_to_cart_button\', \'woocommerce_custom_fields_display\');
  

  要在前端或WooCommerce发送的电子邮件中检索此数据，您可以使用get_post_meta() 功能如下：

  $product_additional_note = get_post_meta( get_the_ID(), \'product_additional_note \', true );
  

  资料来源：
  • Extending WooCommerce Products With Custom Fields
  • How to add custom fields to WooCommerce Product Data metabox