User Authentication System Project
User Authentication System Project
In this lesson, you will build a complete User Authentication System using PHP and MySQL. This project focuses on secure login, registration, and session management.
Project Overview
The User Authentication System allows you to:
- Register new users
- Login users securely
- Maintain session-based authentication
- Logout users
Database Design
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(100),
email VARCHAR(100),
password VARCHAR(255)
);
Step 1: Database Connection
$conn = new mysqli(“localhost”, “root”, “”, “test_db”);
if ($conn->connect_error) {
die(“Connection failed”);
}
?>
Step 2: Registration System
$username = $_POST[‘username’];
$email = $_POST[’email’];
$password = password_hash($_POST[‘password’], PASSWORD_DEFAULT);
$stmt = $conn->prepare(“INSERT INTO users (username, email, password) VALUES (?, ?, ?)”);
$stmt->bind_param(“sss”, $username, $email, $password);
$stmt->execute();
echo “User registered successfully”;
?>
Step 3: Login System
session_start();
$username = $_POST[‘username’];
$password = $_POST[‘password’];
$stmt = $conn->prepare(“SELECT password FROM users WHERE username=?”);
$stmt->bind_param(“s”, $username);
$stmt->execute();
$result = $stmt->get_result();
$user = $result->fetch_assoc();
if ($user && password_verify($password, $user[‘password’])) {
$_SESSION[‘username’] = $username;
echo “Login successful”;
} else {
echo “Invalid credentials”;
}
?>
Step 4: Protect Dashboard
session_start();
if (!isset($_SESSION[‘username’])) {
header(“Location: login.php”);
exit();
}
echo “Welcome “ . $_SESSION[‘username’];
?>
Step 5: Logout System
session_start();
session_destroy();
echo “Logged out successfully”;
?>
Features of the Project
- Secure login and registration
- Password hashing
- Session-based authentication
- Protected routes
Why This Project is Important
Authentication systems are used in almost every web application. This project helps you understand security practices and user management.
Best Practices
Use Password Hashing
Never store plain passwords.
Use Prepared Statements
Prevent SQL injection.
Secure Sessions
Regenerate session IDs and use HTTPS.
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FAQs – User Authentication System
What is authentication system
It verifies user identity.
How does login work
It checks credentials from database.
Why hash passwords
To protect user data.
What is session
It maintains user login state.
Can I improve this system
Yes, by adding email verification and roles.