用PHP实现微信活动抽奖功能

require_once 'WechatOAuth.php';

//在配置中填写你的微信公众号的AppID和AppSecret
$appid = '你的AppID';
$secret = '你的AppSecret';

$wechat = new WechatOAuth($appid, $secret);

//获取用户授权
$code = $_GET['code'];

//通过授权获取access_token
$access_token = $wechat->getAccessToken($code);

//获取用户信息
$user_info = $wechat->getUserInfo($access_token['openid'], 'zh_CN');

require_once 'WechatOAuth.php';

//在配置中填写你的微信公众号的AppID和AppSecret
$appid = '你的AppID';
$secret = '你的AppSecret';

$wechat = new WechatOAuth($appid, $secret);

//获取用户授权
$code = $_GET['code'];

//通过授权获取access_token
$access_token = $wechat->getAccessToken($code);

//获取用户信息
$user_info = $wechat->getUserInfo($access_token['openid'], 'zh_CN');

//判断用户是否已关注公众号
$is_subscribe = $user_info['subscribe'];
if (!$is_subscribe) {
    //用户未关注公众号，不能参加活动
    echo "请先关注公众号再参加活动";
    exit;
}

//连接数据库
$servername = "localhost";
$username = "你的数据库用户名";
$passWord = "你的数据库密码";
$dbname = "你的数据库名称";

$conn = mysqli_connect($servername, $username, $password, $dbname);
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

//查询数据库中是否存在该用户
$openid = $user_info['openid'];
$sql = "SELECT * FROM `users` WHERE `openid` = $openid";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
    //用户已经参加过抽奖，不能重复参加
    echo "您已经参加过抽奖了，不能重复参加";
    exit;
}

//将用户信息存入数据库中
$sql = "INSERT INTO `users`(`openid`, `nickname`, `avatar`) VALUES ('$openid', '$user_info[nickname]', '$user_info[headimgurl]')";
if (mysqli_query($conn, $sql)) {
    echo "参加抽奖成功";
} else {
    echo "存储用户信息失败: " . mysqli_error($conn);
}

mysqli_close($conn);

//产生0到100的随机数
$rand_num = rand(0, 100);

if ($rand_num < 50) {
    //中奖
    echo "恭喜您获得一等奖";
} elseif ($rand_num < 80) {
    //中奖
    echo "恭喜您获得二等奖";
} elseif ($rand_num < 95) {
    //中奖
    echo "恭喜您获得三等奖";
} else {
    //未中奖
    echo "很遗憾，您没有中奖";
}