我想插入多维数组的值到php数据库的唯一值

$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

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

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

$sql = "INSERT INTO users (name, email) VALUES (?, ?)";
$stmt = $conn->prepare($sql);

foreach ($data as $row) {
    $name = $row['name'];
    $email = $row['email'];

    $stmt->bind_param("ss", $name, $email);
    $stmt->execute();
}

$stmt->close();
$conn->close();