Drupal 6 CCK Get Allowed Fields List

function get_cck_text_field_allowed_values($field_name)
{
  $result = db_query("SELECT * FROM {node_field} WHERE field_name = '%s'", $field_name);
  if($row = db_fetch_array($result)){
    $field = unserialize($row['global_settings']);
    if($field['allowed_values']){
 
      $allowed_values = array();
      if ($field['allowed_values_php']) {
        ob_start();
        $result = eval($field['allowed_values_php']);
        if (is_array($result)) {
          $allowed_values = $result;
        }
        ob_end_clean();
      }
      if (!$allowed_values) {
 
        $list = explode("\n", $field['allowed_values']);
        $list = array_map('trim', $list);
        $list = array_filter($list, 'strlen');
        foreach ($list as $opt) {
          // Sanitize the user input with a permissive filter.
          $opt = content_filter_xss($opt);
          list($key, $value) = explode('|', $opt);
          $allowed_values[$key] = (isset($value) && $value !=='') ? $value : $key;
        }
      }
      return $allowed_values;
    }
  }
  return NULL;
}