PHPを使用してWeChatアプレットの投票機能を開発するにはどうすればよいですか?

CREATE TABLE `options` (
  `id` int(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `option_name` varchar(255) NOT NULL,
  `votes` int(11) NOT NULL DEFAULT '0'
);

<?php
// 连接到数据库
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "vote";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 设置字符集
mysqli_set_charset($conn, "utf8");
?>

<?php
// 获取投票选项
function getOptions() {
    global $conn;

    $sql = "SELECT * FROM options";
    $result = $conn->query($sql);

    $options = array();
    if ($result->num_rows > 0) {
        while($row = $result->fetch_assoc()) {
            $option = array(
                "id" => $row["id"],
                "name" => $row["option_name"],
                "votes" => $row["votes"]
            );
            array_push($options, $option);
        }
    }

    return $options;
}

// 处理请求
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $result = getOptions();
    echo json_encode($result);
}
?>

<?php
// 投票
function vote($optionId) {
    global $conn;

    // 首先检查选项是否存在
    $sql = "SELECT * FROM options WHERE id = $optionId";
    $result = $conn->query($sql);
    if ($result->num_rows > 0) {
        // 更新投票数量
        $sql = "UPDATE options SET votes = votes + 1 WHERE id = $optionId";
        $conn->query($sql);
        return true;
    } else {
        return false;
    }
}

// 处理请求
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents('php://input'), true);
    $optionId = $data['optionId'];
    
    $result = vote($optionId);
    echo json_encode($result);
}
?>

// 小程序代码
Page({
  vote: function(optionId) {
    wx.request({
      url: 'https://your_server_url/api.php',
      method: 'POST',
      data: {
        optionId: optionId
      },
      success: function (res) {
        console.log(res.data);
        if (res.data) {
          wx.showToast({
            title: '投票成功'
          });
        } else {
          wx.showToast({
            title: '投票失败'
          });
        }
      }
    });
  }
});