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php实现砍价

2026-02-14 21:04:27PHP

PHP实现砍价功能

砍价功能是电商平台常见的促销方式，用户可以通过邀请好友帮忙砍价来降低商品价格。以下是实现砍价功能的PHP代码示例和关键逻辑。

数据库设计

需要创建砍价活动表和砍价记录表：

CREATE TABLE `bargain_activity` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_id` int(11) NOT NULL COMMENT '商品ID',
  `min_price` decimal(10,2) NOT NULL COMMENT '最低砍价金额',
  `max_price` decimal(10,2) NOT NULL COMMENT '最高砍价金额',
  `start_time` datetime NOT NULL COMMENT '开始时间',
  `end_time` datetime NOT NULL COMMENT '结束时间',
  PRIMARY KEY (`id`)
);

CREATE TABLE `bargain_record` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `activity_id` int(11) NOT NULL COMMENT '活动ID',
  `user_id` int(11) NOT NULL COMMENT '用户ID',
  `cut_price` decimal(10,2) NOT NULL COMMENT '砍掉金额',
  `create_time` datetime NOT NULL COMMENT '砍价时间',
  PRIMARY KEY (`id`)
);

砍价逻辑实现

class BargainService {
    // 用户发起砍价
    public function startBargain($userId, $activityId) {
        // 检查活动是否有效
        $activity = $this->getActivity($activityId);
        if (!$activity || time() < strtotime($activity['start_time']) || time() > strtotime($activity['end_time'])) {
            return ['code' => 0, 'msg' => '活动已结束或不存在'];
        }

        // 检查是否已参与过
        if ($this->checkParticipated($userId, $activityId)) {
            return ['code' => 0, 'msg' => '您已参与过本次活动'];
        }

        // 创建砍价记录
        $bargainId = $this->createBargainOrder($userId, $activityId);

        return ['code' => 1, 'msg' => '砍价发起成功', 'data' => ['bargain_id' => $bargainId]];
    }

    // 好友帮忙砍价
    public function helpBargain($userId, $bargainId) {
        // 获取砍价订单信息
        $order = $this->getBargainOrder($bargainId);
        if (!$order) {
            return ['code' => 0, 'msg' => '砍价订单不存在'];
        }

        // 检查活动是否有效
        $activity = $this->getActivity($order['activity_id']);
        if (!$activity || time() < strtotime($activity['start_time']) || time() > strtotime($activity['end_time'])) {
            return ['code' => 0, 'msg' => '活动已结束'];
        }

        // 检查是否已帮忙砍价
        if ($this->checkHelped($userId, $bargainId)) {
            return ['code' => 0, 'msg' => '您已帮TA砍过价'];
        }

        // 生成砍价金额
        $cutPrice = $this->generateCutPrice($activity['min_price'], $activity['max_price']);

        // 记录砍价
        $this->recordBargain($bargainId, $userId, $cutPrice);

        // 更新砍价订单
        $this->updateBargainOrder($bargainId, $cutPrice);

        return ['code' => 1, 'msg' => '砍价成功', 'data' => ['cut_price' => $cutPrice]];
    }

    // 生成随机砍价金额
    private function generateCutPrice($min, $max) {
        return round(mt_rand($min*100, $max*100)/100, 2);
    }
}