php 上下翻页

<?php
// 数据库连接
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 获取当前页码，默认为第一页
$page = isset($_GET['page']) ? intval($_GET['page']) : 1;
$limit = 10; // 每页显示的记录数
$offset = ($page - 1) * $limit;

// 查询数据
$sql = "SELECT * FROM table_name LIMIT $limit OFFSET $offset";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 获取总记录数
$sql = "SELECT COUNT(*) as total FROM table_name";
$totalResult = $conn->query($sql);
$totalRow = $totalResult->fetch_assoc();
$total = $totalRow['total'];

// 计算总页数
$totalPages = ceil($total / $limit);

// 上一页和下一页链接
echo "<a href='?page=" . ($page - 1) . "'>上一页</a> ";
echo "<a href='?page=" . ($page + 1) . "'>下一页</a>";

$conn->close();
?>