prepare("INSERT INTO users (username, password) VALUES (?, ?)");
if ($stmt->execute([$username, $password])) {
$_SESSION['user_id'] = $pdo->lastInsertId();
header('Location: index.php');
} else {
echo "Username taken.";
}
} elseif (isset($_POST['login'])) {
// Login
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = ?");
$stmt->execute([$username]);
$user = $stmt->fetch();
if ($user && password_verify($_POST['password'], $user['password'])) {
$_SESSION['user_id'] = $user['id'];
header('Location: index.php');
} else {
echo "Invalid credentials.";
}
}
}
?>
Register/Login
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