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请帮我拿这个
致命错误：未捕获的错误：在C：\xampp\htdocs\final_program\php\loged_in中找不到类“mysqli_connect”。Copyright © 2018 - 2019 www.jsjsj.com All Rights Reserved版权所有
我尝试删除分号（;）以取消注解它：

extension=mysqli

但我的PHP代码仍然没有连接到我的数据库phpmyadmin它只显示此代码
致命错误：未捕获的错误：在C：\xampp\htdocs\final_program\php\loged_in中找不到类“mysqli_connect”。Copyright © 2018 - 2019 www.jsjsj.com All Rights Reserved版权所有

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

$conn = new mysqli_connect($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

if (isset($_POST['login'])) {
    // Get username and password from form data and validate them
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Check if the username and password are correct
    // In this example, we're using a MySQLi prepared statement to protect against SQL injection
    $stmt = $conn->prepare("SELECT * FROM users WHERE username = ? AND password = ?");
    $stmt->bind_param("ss", $username, $password);
    $stmt->execute();
    $result = $stmt->get_result();

    if ($result->num_rows == 1) {
        // If the user is authenticated, set the user's login status to true
        // In this example, we're just using a session variable to store the login status
        $_SESSION['logged_in'] = true;
    }
}

if (isset($_SESSION['logged_in']) && $_SESSION['logged_in'] == true) {
    // If the user is logged in, display the success container by changing the CSS display property
    echo '<style>.success-container { display: block; }</style>';```