如何使用PHP和MySQL显示用户聊天

// 连接数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

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

// 查询聊天记录
$sql = "SELECT * FROM chat_messages ORDER BY send_time ASC";
$result = $conn->query($sql);

// 显示聊天记录
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "发送者ID: " . $row["sender_id"]. " - 消息内容: " . $row["message"]. "<br>";
    }
} else {
    echo "没有聊天记录";
}

$conn->close();