How can the code be modified to implement a more robust and scalable user authentication system, considering the current structure and logic?

The code can be modified to implement a more robust and scalable user authentication system by incorporating features such as password hashing, salting, and using prepared statements to prevent SQL injection attacks. Additionally, implementing session management and secure cookie handling can enhance the security of the authentication system. 

<?php

// Start a session
session_start();

// Database connection
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

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

// User authentication function
function authenticateUser($username, $password) {
    global $conn;

    $stmt = $conn->prepare("SELECT id, username, password FROM users WHERE username = ?");
    $stmt->bind_param("s", $username);
    $stmt->execute();
    $result = $stmt->get_result();

    if ($result->num_rows == 1) {
        $user = $result->fetch_assoc();
        if (password_verify($password, $user['password'])) {
            $_SESSION['user_id'] = $user['id'];
            return true;
        }
    }

    return false;
}

// Logout function
function logoutUser() {
    session_unset();
    session_destroy();
}

?>

Keywords

authentication scalability PHP user modification

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