php做留言板网页

CREATE TABLE messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    message TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

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

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "<p>" . $row["name"] . ": " . $row["message"] . " (" . $row["created_at"] . ")</p>";
    }
} else {
    echo "没有留言";
}

// 提交留言
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $message = $_POST["message"];

    $sql = "INSERT INTO messages (name, message) VALUES ('$name', '$message')";

    if ($conn->query($sql) === TRUE) {
        echo "留言成功";
    } else {
        echo "错误: " . $sql . "<br>" . $conn->error;
    }
}
$conn->close();
?>

<!DOCTYPE html>
<html>
<head>
    <title>留言板</title>
</head>
<body>
    <h1>留言板</h1>
    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
        <label for="name">姓名:</label>
        <input type="text" id="name" name="name"><br><br>
        <label for="message">留言:</label>
        <textarea id="message" name="message"></textarea><br><br>
        <input type="submit" value="提交">
    </form>
</body>
</html>