taxonomy_form_options($machine_name) Drupal 7

gistfile1.aw

<?php
/**
 * returns a array for use with #options in a form field
 * */
function taxonomy_options_array($machine_name, $all = NULL) {
  $v = taxonomy_vocabulary_machine_name_load($machine_name);

  if (!empty($all)) {
    $options[$all[0]] = $all[1];
  }

  $terms = taxonomy_get_tree($v->vid);
  foreach ($terms as  $term) {
    $options[$term->tid] = $term->name;
  }
  return $options;
}