username or email validation in laravel

All we need is add a method in app/Http/Controllers/Auth/LoginController.php:

/**
 * Get the login username to be used by the controller.
 *
 * @return string
 */
public function username()
{
    return 'username';
}

$input = $request->only('account'); // dont use all(), ever
            
$rules = [
  'account' => 'required'
];

if (filter_var($input['account'], FILTER_VALIDATE_EMAIL)) {

  $rules['account'] .= '|exists:users,email';

} else {

  $rules['account'] .= '|exists:users,username';

}

$messages = [
  'account.required' => 'Enter username or email to login.',                
];

$validator = Validator::make($input, $rules, $messages);