我如何在WooCommerce上获得关于订单的最新说明？

我想当订单处于（处理）位置时，向客户发送短信，如何获取订单中的最后一个注释并将其放入（%comment%）键中？

    if ( isset( $this->options[\'wc_notify_customer_payment_successful_enable\'] ) ) {
        add_action( \'woocommerce_order_status_processing\', array( &$this, \'successful_payment_notification_client\' ) );
    }



* WooCommerce Successful payment notification client 
 *
 * @param $checkout
 */
public function successful_payment_notification_client ( $order_id ) {
    // Check the mobile field is empty
    if ( empty( $_REQUEST[\'mobile\'] ) ) {
        return;
    }

    $order          = new WC_Order( $order_id );
    $this->sms->to  = array( $_REQUEST[\'mobile\'] );
    $template_vars  = array(
        \'%order_id%\'           => $order_id,
        \'%order_number%\'       => $order->get_order_number(),
        \'%status%\'             => $order->get_status(),
        \'%billing_first_name%\' => $_REQUEST[\'billing_first_name\'],
        \'%billing_last_name%\'  => $_REQUEST[\'billing_last_name\'],
        \'%comment%\'            => **What I say is here**
    );
    $message        = str_replace( array_keys( $template_vars ), array_values( $template_vars ), $this->options[\'wc_notify_customer_payment_successful_message\'] );
    $this->sms->msg = $message;
    $this->sms->SendSMS();
}

$args = array( \'post_id\' => $order_id, \'orderby\' => \'comment_ID\', \'order\' => \'DESC\', \'approve\' => \'approve\', \'type\' => \'order_note\', \'number\' => 1 ); remove_filter( \'comments_clauses\', array( \'WC_Comments\', \'exclude_order_comments\' ), 10, 1 ); $notes = get_comments( $args ); add_filter( \'comments_clauses\', array( \'WC_Comments\', \'exclude_order_comments\' ), 10, 1 );

更改回调wp_Query的POSTS_ORDERBY？

我发现this answer 这有助于在我的搜索查询中按帖子类型对查询结果排序。但问题是当我去https://example.com/?s=query%20string 如果我使用原生php搜索进行搜索。这太棒了。但我也可以通过ajax进行搜索——当我键入时，ajax将调用在自定义rest端点上注册的回调函数。因此，我想知道是否有任何方法可以识别该自定义查询，以便重用该过滤器？在条件中：if ( ! is_admin() && is_search() && is_

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更改回调wp_Query的POSTS_ORDERBY？