因此，我将mysql数据导入到phpadmin中的codeigniter和xampp下，但是当我运行代码时，得到了Class "mysqli" not found错误
image error

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "sex_disaggrated";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
                }

我已经将**. env**文件更改为该文件

database.default.hostname = localhost
database.default.database = sex_disaggrated
database.default.username = root
database.default.password = 
database.default.DBDriver = MySQLi

编辑：
Php Mysqli