uniapp每日签到功能如何实现：后端PHP与前端uniapp的交互详解？

// 1. 获取openid$openid = $_get['openid'];// 2. 查找当天签到记录$sql = "select * from sign_in_records where openid = '$openid' and date(sign_in_date) = curdate()";$result = $conn->query($sql);// 3. 处理签到逻辑if ($result->num_rows > 0) {  echo "已签到过";} else {  // 4. 插入签到记录  $sql = "insert into sign_in_records (openid, sign_in_date, sign_in_reward) values ('$openid', curdate(), $reward)";  $conn->query($sql);  // 5. 生成签到积分奖励  $reward = rand(1, 100);  echo "签到成功，获得签到积分奖励：$reward";}

// 调用后端签到接口uni.request({  url: 'api/sign_in',  method: 'GET',  data: {    openid: uni.getStorageSync('openid')  },  success: (res) => {    console.log(res.data);  }});