Drupal: Custom breadcrumbs for books showing hierarchy and parent's taxonomy #drupal #breadcrumbs

breadcrumb_books.php

<?php /**
* Custom breadcrumbs for books showing hierarchy and parent's taxonomy.
*/
function feature_book_node_view($node, $view_mode, $langcode) {
  if ($node->type == 'books') {
    // Node is a parent.
    if ($node->book['p2'] == '0') {
      $wrapper = entity_metadata_wrapper('node', $node);
      $themawrapper = $wrapper->field_taxonomy[0]; // Replace field_taxonomy with the propper taxonomy field.

      $breadcrumb = array();
      // Home.
      $breadcrumb[] = l(t('Home'), '<front>');
      // Thema for this node
      $breadcrumb[] = l($themawrapper->name->value(), $themawrapper->url->value());
      // Title for this node.
      //$breadcrumb[] = $wrapper->title->value();
      drupal_set_breadcrumb($breadcrumb);
    }

    else {
      // Node is a child.
      $wrapper = entity_metadata_wrapper('node', $node);
      // We obtain this node's parent.
      $parentwrapper = $wrapper->book;
      $themawrapper = $parentwrapper->field_thema[0]; // Replace field_taxonomy with the propper taxonomy field.

       $breadcrumb = array();
      // Home
      $breadcrumb[] = l(t('Home'), '<front>');
      // Taxonomy for this node's parent
      $breadcrumb[] = l($themawrapper->name->value(), $themawrapper->url->value());
      // Parent's title
      $breadcrumb[] = l($parentwrapper->title->value(), $parentwrapper->url->value());
      // Title for this node
      //$breadcrumb[] = $wrapper->title->value();
      drupal_set_breadcrumb($breadcrumb);
    }
  }
}