php留言板分页显示

<?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);
}

// 每页显示的条目数
$items_per_page = 10;

// 获取当前页码，默认为第一页
$page = isset($_GET['page']) ? intval($_GET['page']) : 1;

// 计算偏移量
$offset = ($page - 1) * $items_per_page;

// 查询留言
$sql = "SELECT * FROM messages ORDER BY id LIMIT $offset, $items_per_page";
$result = $conn->query($sql);

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

// 计算总页数
$sql = "SELECT COUNT(*) as total FROM messages";
$result = $conn->query($sql);
$row = $result->fetch_assoc();
$total_pages = ceil($row['total'] / $items_per_page);

// 显示分页链接
for ($i = 1; $i <= $total_pages; $i++) {
    echo "<a href='?page=$i'>$i</a> ";
}

$conn->close();
?>