PHP を使用して WeChat ミニ プログラムに宝くじの抽選と特典を実装する方法

    //获取登录凭证
    $code = $_GET['code'];  
    //小程序appid
    $appid = 'xxxx';  
    //小程序secret  
    $secret = 'xxxx';  
    //拼接url
    $url = 'https://api.weixin.qq.com/sns/jscode2session?appid=' . $appid . '&secret=' . $secret . '&js_code=' . $code . '&grant_type=authorization_code';  
    //请求微信API，获取session_key和openid  
    $data = json_decode(file_get_contents($url));

    //查询抽奖规则
    $rule = pdo_fetch("SELECT * FROM `rule` WHERE `id` = {$rule_id}");
    //随机数生成器
    $rand = mt_rand(1, 100);
    //判断用户是否中奖
    if ($rand <= $rule['chance']) {
        //更新中奖记录
        pdo_update("user", array('is_win' => 1), array('id' => $user_id));
        //查询奖品信息
        $award = pdo_fetch("SELECT * FROM `award` WHERE `rule_id` = {$rule_id} AND `num` > 0 ORDER BY RAND() LIMIT 1");
        //如果有奖品
        if ($award['id']) {
            //减少奖品数量
            pdo_query("UPDATE `award` SET `num` = `num` - 1 WHERE `id` = {$award['id']} AND `num` > 0");
            //返回中奖结果
            return array('result' => 'win', 'award_name' => $award['name']);
        }
    } else {
        //返回未中奖结果
        return array('result' => 'lose');
    }

    //查询订单信息
    $order = pdo_fetch("SELECT * FROM `order` WHERE `id` = {$order_id}");
    //查询优惠信息
    $discount = pdo_fetch("SELECT * FROM `discount` WHERE `id` = {$discount_id}");
    //计算优惠后的支付金额
    $pay_price = $order['price'] - $discount['price'];
    //更新订单状态
    pdo_update("order", array('status' => 1), array('id' => $order_id));
    //添加优惠记录
    pdo_insert("discount_record", array('order_id' => $order_id, 'discount_id' => $discount_id, 'price' => $discount['price']));
    //返回优惠后的支付金额
    return $pay_price;