prepare('SELECT * FROM users WHERE username = ?');
$stmt->execute([$username]);
$user = $stmt->fetch(PDO::FETCH_ASSOC);
if ($user && password_verify($password, $user['password'])) {
$_SESSION['user_id'] = $user['id'];
header('Location: index.php');
exit();
} else {
$error = 'Invalid username or password.';
}
}
}
?>
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