<?php

use DrupalnodeEntityNode;

/**
 * Implements hook_preprocess_page().
 */
function alternative_title_preprocess_page(&$variables) {
  // Check if the current route contains a node.
  if ($node = Drupal::routeMatch()->getParameter('node')) {
    // Check if the node type is 'info'.
    if ($node->getType() == 'info') {
      Drupal::messenger()->addMessage('Node type is Info');

      
      $node_title = $node->getTitle();
      // Get the alternative title field value.
      $alternative_title = $node->get('field_titel')->value;

      // If an alternative title exists, use it.
      if (!empty($alternative_title)) {
      $variables['#title'] = $alternative_title;
        Drupal::messenger()->addMessage($variables['#title']);
      } 
    } else {
      Drupal::messenger()->addMessage('Node type is not Info, node type is "' . $node->getType() . '"');
    }
  }
}