mysql留言板插件

<?php
// 数据库连接配置
$host = 'localhost';
$username = 'root';
$password = 'password';
$dbname = 'message_board';

// 连接数据库
$conn = new mysqli($host, $username, $password, $dbname);

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

// 插入留言
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['message'])) {
    $message = $_POST['message'];
    $sql = "INSERT INTO messages (content) VALUES ('$message')";
    if ($conn->query($sql) === TRUE) {
        echo "留言发布成功";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

// 查询留言
$sql = "SELECT * FROM messages";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "留言内容: " . $row["content"] . "<br>";
    }
} else {
    echo "没有留言";
}

$conn->close();
?>