prepare("SELECT * FROM users WHERE username = ?");
$stmt->execute([$username]);
$user = $stmt->fetch();
if ($user && password_verify($password, $user['password_hash'])) {
$_SESSION['user_id'] = $user['id'];
$_SESSION['username'] = $user['username'];
header('Location: dashboard.php');
exit;
} else {
$error = '用户名或密码错误';
}
}
}
?>
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