如何在关联数组中插入数据库结果

$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";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

$data = array(
    'username' => 'John',
    'email' => 'john@example.com'
);

$table = 'users'; // 数据库表名

// 构建插入语句
$sql = "INSERT INTO $table (username, email) VALUES ('" . $data['username'] . "', '" . $data['email'] . "')";

// 执行插入操作
if ($conn->query($sql) === TRUE) {
    echo "数据插入成功";
} else {
    echo "数据插入失败: " . $conn->error;
}

$conn->close();