如何通过单击标题对html表列进行排序[PHP/MYSQL]

<?php
// 连接到MySQL数据库
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

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

// 获取排序参数
$sort = isset($_GET['sort']) ? $_GET['sort'] : 'default';

// 根据排序参数构建MySQL查询的ORDER BY子句
switch ($sort) {
    case 'name_asc':
        $orderBy = 'name ASC';
        break;
    case 'name_desc':
        $orderBy = 'name DESC';
        break;
    case 'age_asc':
        $orderBy = 'age ASC';
        break;
    case 'age_desc':
        $orderBy = 'age DESC';
        break;
    default:
        $orderBy = 'default';
        break;
}

// 执行排序后的MySQL查询
$sql = "SELECT * FROM your_table ORDER BY " . $orderBy;
$result = $conn->query($sql);

// 在HTML表格中显示查询结果
if ($result->num_rows > 0) {
    echo "<table>";
    echo "<tr><th><a href='?sort=name_asc'>Name ↑</a></th><th><a href='?sort=name_desc'>Name ↓</a></th><th><a href='?sort=age_asc'>Age ↑</a></th><th><a href='?sort=age_desc'>Age ↓</a></th></tr>";
    while ($row = $result->fetch_assoc()) {
        echo "<tr><td>" . $row["name"] . "</td><td>" . $row["age"] . "</td></tr>";
    }
    echo "</table>";
} else {
    echo "没有结果";
}

$conn->close();
?>