'localhost', 'dbname' => 'auth_system', 'username' => 'root', 'password' => '', 'charset' => 'utf8mb4' ]; pdo = new PDO( "mysql:host={$config['host']};dbname={$config['dbname']};charset={$config['charset']}", $config['username'], $config['password'] ); $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $e) { die("Database connection failed: " . $e->getMessage()); } } public static function getInstance() { if (!self::$instance) { self::$instance = new self(); } return self::$instance; } public function getConnection() { return $this->pdo; } } db = Database::getInstance()->getConnection(); } public function register($username, $email, $password) { $hashedPassword = password_hash($password, PASSWORD_BCRYPT); $stmt = $this->db->prepare("INSERT INTO users (username, email, password) VALUES (?, ?, ?)"); return $stmt->execute([$username, $email, $hashedPassword]); } public function login($email, $password) { $stmt = $this->db->prepare("SELECT * FROM users WHERE email = ?"); $stmt->execute([$email]); $user = $stmt->fetch(PDO::FETCH_ASSOC); if ($user && password_verify($password, $user['password'])) { $_SESSION['user_id'] = $user['id']; $_SESSION['username'] = $user['username']; return true; } return false; } public function isLoggedIn() { return isset($_SESSION['user_id']); } public function logout() { session_destroy(); } } :root { --primary-color: #4361ee; --secondary-color: #3f37c9; --accent-color: #4895ef; --light-color: #f8f9fa; --dark-color: #212529; --success-color: #4cc9f0; --danger-color: #f72585; } * { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; } body { background-color: #f5f5f5; display: flex; justify-content: center; align-items: center; min-height: 100vh; background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%); } .auth-container { background: white; border-radius: 10px; box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1); width: 400px; max-width: 100%; overflow: hidden; transition: all 0.3s ease; } .auth-container:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15); } .auth-header { background: var(--primary-color); color: white; padding: 20px; text-align: center; } .auth-header h2 { font-weight: 600; } .auth-form { padding: 30px; } .form-group { margin-bottom: 20px; position: relative; } .form-group label { display: block; margin-bottom: 8px; font-weight: 500; color: var(--dark-color); } .form-group input { width: 100%; padding: 12px 15px; border: 2px solid #ddd; border-radius: 5px; font-size: 16px; transition: all 0.3s; } .form-group input:focus { border-color: var(--accent-color); outline: none; box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2); } .btn { display: inline-block; background: var(--primary-color); color: white; border: none; padding: 12px 20px; border-radius: 5px; cursor: pointer; font-size: 16px; font-weight: 500; width: 100%; transition: all 0.3s; } .btn:hover { background: var(--secondary-color); transform: translateY(-2px); } .toggle-form { text-align: center; margin-top: 20px; color: var(--dark-color); } .toggle-form a { color: var(--primary-color); text-decoration: none; font-weight: 500; transition: all 0.3s; } .toggle-form a:hover { color: var(--secondary-color); } .alert { padding: 12px; border-radius: 5px; margin-bottom: 20px; font-size: 14px; } .alert-danger { background-color: #ffebee; color: var(--danger-color); border: 1px solid #ffcdd2; } .alert-success { background-color: #e8f5e9; color: #2e7d32; border: 1px solid #c8e6c9; } @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } } .auth-container { animation: fadeIn 0.5s ease-out; } login($email, $password)) { header('Location: dashboard.php'); exit; } else { $error = 'Invalid email or password'; } } ?> Login

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register($username, $email, $password)) { header('Location: login.php?registered=1'); exit; } else { $errors[] = 'Registration failed. Please try again.'; } } } ?> Register

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isLoggedIn()) { header('Location: login.php'); exit; } ?> Dashboard

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logout(); header('Location: login.php'); exit; ?> getConnection(); $db->exec(" CREATE TABLE IF NOT EXISTS users ( id INT AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL, email VARCHAR(100) NOT NULL UNIQUE, password VARCHAR(255) NOT NULL, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ) "); echo "Database tables created successfully!"; } catch (PDOException $e) { die("Error creating tables: " . $e->getMessage()); } ?>