I want to be able to call the current nodes taxonomy tree from page.tpl.php by using a function already in the taxonomy module. So far I've only been able to obtain the current nodes taxonomy id with:

$tid = $variables['node']->field_category['und'][0]['tid'];

I tried using: taxonomy_get_tree($tid);

but this only returns an empty array.

is there a way for me to use functions from other modules in _preprocess_page ?

full code:

function centro_preprocess_page(&$variables) {
     $tid = $variables['node']->field_category['und'][0]['tid'];
     $variables['taxTree'] = taxonomy_get_tree($tid);
  • You are indeed using the function successfully. I don't understand what you want to ask.
    – Jimmy Ko
    Jul 5, 2016 at 16:37
  • Did you use print_r($result) to check the tree?
    – jmu
    Jul 5, 2016 at 16:40
  • i used print_r(taxonomy_get_tree($tid)); but all i get is array(){}
    – blu
    Jul 5, 2016 at 17:00

1 Answer 1


You are getting a taxonomy id. However, taxonomy_get_tree needs a vocabulary id as parameter, according to the documentation: https://api.drupal.org/api/drupal/modules%21taxonomy%21taxonomy.module/function/taxonomy_get_tree/7.x . That's probably why you are getting an empty array.

In order to be able to call taxonomy_get_tree, you would need to get the vocabulary id first:

$term = taxonomy_term_load($tid);
$vid = $term->vid;

(see this question for more details about getting the vid from a tid).

  • thanks this works. I'm guessing $vid is what distinguishes between tags and other types of custom taxonomy
    – blu
    Jul 5, 2016 at 17:36
  • Yes, exactly. "Tags" (created by default when you install a Drupal site) is only one of the many vocabularies you can define. Each taxonomy term belongs to a vocabulary.
    – dinopmi
    Jul 5, 2016 at 19:15

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