Php 自动投标人正在跳过秒

我正在建立一分钱拍卖网站。我对自动驾驶者有些问题。起初，我让bash脚本打开php并设置睡眠1秒，但服务器跳过了几秒，而我尝试从phpmyadmin运行事件，但情况相同。日志表中跳过的次数如下：

23:08:02; 23:08:06; 23:08:16; 23:08:16; 23:08:16; 23:08:18; 23:08:19; 23:08:20; 23:08:21; 如何使自动投标机不跳过秒数

以下是我在phpmyadmin事件中使用的代码：

---

请添加示例代码。我已添加事件代码。

BEGIN
SET @user_id = 0;
SET @product_id = 0;
SET @CurPrice = 0;
SET @plusSec = 12;
SET @intervalSec = 3;

SELECT @user_id:=au.user_id,@price := au.price,@CurPrice := pr.CurrentPrice + CONCAT('0.0',pr.x), @x :=pr.x,
                 @product_id := au.product_id
FROM autobids AS au
LEFT JOIN products AS pr ON au.product_id = pr.id 
WHERE(au.user_id !=
(SELECT user_id
    FROM bids_log
    WHERE products_id = pr.id
    ORDER BY id DESC LIMIT 1)) AND( pr.endDate > NOW()
    AND pr.endDate <= NOW() + interval @intervalSec second)
ORDER BY RAND() LIMIT 1;

INSERT INTO `table_name`.`bids_log` (`id`, `products_id`, `user_id`, `price`,`data`)
VALUES (NULL, @product_id, @user_id, @CurPrice, NOW());

UPDATE `table_name`.`products` SET `CurrentPrice` = @CurPrice ,`endDate` =  DATE_ADD(endDate, INTERVAL @plusSec second) WHERE `products`.`id` = @product_id;

UPDATE `table_name`.`autobids` SET `price` = `price` - @x  WHERE `user_id` = @user_id AND `product_id`= @product_id;
INSERT INTO `table_name`.`event` (`id`, `rame`) VALUES (NULL, NOW());
END