Blocks on Taxonomy Pages: Determining TID and Parent VID?

If on a term listing page, create an array of terms being viewed:

<?php
      if (arg(0) == 'taxonomy' && arg(1) == 'term') {
        $tids = preg_split('/[+ ,]/', arg(2));
      }
?>

arg(2) = '2' when the url is 'taxonomy/term/2', or '2+5' when the url is 'taxonomy/term/2+5/5' etc

if arg(2) is '2+5', $tids[0] is 2 and $tids[1] is 5 etc

More examples:

Given a term id, fetch a term object:

<?php
  $term_obj = taxonomy_get_term($term_id);
?>

or given an array of term ids (eg from the first example) , fetch the term object of the first term id in the array:

<?php
  $term_obj = taxonomy_get_term($tids[0]);
?>

Given a term object, fetch its vocabulary id:

<?php
  $vocab_id = $term_obj->vid;
?>

Given a term object, fetch its vocabulary object:

<?php
  $vocab_obj = taxonomy_get_vocabulary($term_obj->vid);
?>

From a term object get the description:

<?php
  $desc = $term_obj->description;
?>

Taxonomy API reference:
http://api.drupal.org/api/4.7/file/modules/taxonomy.module

I suggest you install the devel module as it has a php textarea where you can type in php expressions into Drupal and see the results. It also has a dprint_r() function that pretty prints the contents of arrays and objects to let you see the internal structure of items returned by API functions.

--
Anton
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