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How to set the page title in Drupal 8? drupal_set_title() in Drupal 8 ? drupal_get_title() in Drupal8?

Using the following lines of code in hook_form_alter() , able to set the title and get the title

after saving the code do CLEAR CACHE

drupal_set_title() in Drupal8

$request = \Drupal::request();
if ($route = $request->attributes->get(\Symfony\Cmf\Component\Routing\RouteObjectInterface::ROUTE_OBJECT)) {
  $route->setDefault('_title', 'New Title');
}

drupal_get_title() in Drupal8


$request = \Drupal::request();
if ($route = $request->attributes->get(\Symfony\Cmf\Component\Routing\RouteObjectInterface::ROUTE_OBJECT)) {
  $title = \Drupal::service('title_resolver')->getTitle($request, $route);
}

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