yusufhm

<?php

// The following snippet updates the filter format configuration.
$config_path = drupal_get_path('module', 'my_custom_module') . '/config/install'; // or any path containing config files theoretically.
$source = new FileStorage($config_path);
$config_storage = \Drupal::service('config.storage');
$config_storage->write('filter.format.basic_html', $source->read('filter.format.basic_html'));

morsok

 use Drupal\Core\Url;
 use Symfony\Component\HttpFoundation\Request;
 
 function my_function() {
  $previousUrl = \Drupal::request()->server->get('HTTP_REFERER');
  $fake_request = Request::create($previousUrl);
  $url_object = \Drupal::service('path.validator')->getUrlIfValid($fake_request->getRequestUri());
  if ($url_object) {
    $route_name = $url_object->getRouteName();
    // Do something with $route_name;