How to use PHP to implement lottery draws and benefits in WeChat mini programs

With the popularity of WeChat mini programs, more and more companies are beginning to conduct business through WeChat mini programs. Among them, lottery draws and welfare activities can not only enhance user stickiness, but also enhance corporate visibility. This article will introduce how to use PHP to implement lottery and welfare activities in WeChat mini programs.

1. Login to the WeChat Mini Program

First of all, we need to understand the login to the WeChat Mini Program. In the WeChat mini program, if the user needs to log in, he must open the login authorization page provided by WeChat and agree to the authorization. Only then can we obtain the user's information and conduct lottery and welfare operations. It can be understood that the user is authorized to obtain the login credentials, and then uses the obtained credentials to perform subsequent operations.

Code implementation:

    //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));

2. WeChat Mini Program Lottery

1. Preparation work before the lottery

Before the lottery, We need to prepare lottery data and rules.

• Lottery data: including prize name, prize quantity, winning rate and other information;
• Lottery rules: indicate which users can participate in the lottery, how to distribute prizes, etc.

2. User Lottery

When a user participates in the lottery, we need to implement the following steps:

• Verify whether the user has Qualification to participate in the lottery (that is, whether it meets the lottery rules);
• Randomly generate the winning result based on the winning rate;
• If you win, the number of prizes will be reduced by 1 and the winning information will be returned;
• If you don’t win, return the non-winning information directly.

It should be noted here that in order to prevent malicious users from cheating on prizes, we can control it by limiting the number of draws that users can draw every day.

Code implementation:

    //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');
    }

3. WeChat Mini Program Welfare

Welfare activities refer to enterprises launching promotions, discounts, gifts and other preferential activities in WeChat Mini Program to attract users Participate and thereby increase sales. The following are the steps to implement welfare activities:

1. Determine the content of welfare activities

Enterprises need to first determine the type, content and time of welfare activities, and formulate corresponding plans based on this information plan.

2. Publish welfare activities

Through the WeChat mini program operating platform, companies can publish welfare activities, such as pushing messages, publishing advertisements, binding products, etc.

3. Achieve preferential processing

The ultimate goal of welfare activities is to attract users to purchase, so preferential processing needs to be implemented in the payment process. Specifically, the discount amount or red envelope coupons and other information are recorded in the order information, and then PHP is used to process the discount in the background.

Code implementation:

    //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;

The above is how to use PHP to implement lottery and welfare activities in WeChat mini programs. Through the introduction of this article, I believe that readers have mastered the basic implementation methods of these operations, and I hope it will be helpful to readers.

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