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I need to get the id of the node category.

I try this:

$variables['tid'] = $node->field_category->target_id;
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I wrote this answer thinking the question was for Drupal 7. This is not accurate for Drupal 8.

If you debug the $node object, you will see that it's more complicated than that. It has a language and probably a value index. So, you could access the TID this way:

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

But, don't do it that way. It would be better to use EntityMetadataWrapper. The code should look something like this:

$wrapper = entity_metadata_wrapper('node', $node);
$variables['tid'] = $wrapper->field_category->raw();

If you want the whole term object, you can do this:

$variables['term'] = $wrapper->field_category->value();
  • entity_metadata_wrapper is a Drupal 7 thing, it can't be used in Drupal 8 (mainly because it's obsolete) – Clive Mar 23 '17 at 14:39
  • I didn't notice that the question was for Drupal 8. I will clarify my response. – Wayne Eaker Mar 24 '17 at 13:31

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