<?php
  // EXAMPLE VISIBILITY 1

  // define variables for conditions
  // // taxonomy term IDs
  $tids = array(27, 24);
  // // book node IDs
  $books = array(198, 166);

  // if this is a taxonomy listing, check the tids
  if (arg(0) == 'taxonomy' && arg(1) == 'term' && is_numeric(arg(2))) {
    if (in_array(arg(2), $tids)) {
      return TRUE;
    }
  }

  if (arg(0) == 'node' && is_numeric(arg(1))) {
    $node = node_load(arg(1));
  }

  // if this node is located in a certain book, use this section
  if($node->nid && $node->book['bid'] && in_array($node->book['bid'], $books)) {
    return TRUE;
  }

  // if this node is categorized with a certain taxonomy term id, use section
  if ($node->nid && is_array($node->taxonomy) && !empty($node->taxonomy))  {
    foreach($node->taxonomy as $tid => $term) {
      if (in_array($term->tid, $tids)) {
        return TRUE;
      }
    }
  }

  // else we are not in this section
  return FALSE;
?>



<?php
  // VISIBILITY EXAMPLE 2

  // define variables for conditions
  // // taxonomy term IDs
  $tids = array(34, 33);
  // // book node IDs
  $books = array(562, 551); /// 553 removed

  // domain name in URL logic
  $domain = $_SERVER['HTTP_HOST'];
  if (stristr($domain,"subdomain.domainname") !== FALSE || stristr($domain,"subdomain2.domainname") !== FALSE)
  {
    return TRUE;
  }


  // if this is a taxonomy listing, check the tids
  if (arg(0) == 'taxonomy' && arg(1) == 'term' && is_numeric(arg(2))) {
    if (in_array(arg(2), $tids)) {
      return TRUE;
    }
  }

  if (arg(0) == 'node' && is_numeric(arg(1))) {
    $node = node_load(arg(1));
  }


  // if this node is located in a certain book, use this section
  if($node->nid && $node->book['bid'] && in_array($node->book['bid'], $books)) {
    return TRUE;
  }

  // if this node is categorized with a certain taxonomy term id, use section
  if ($node->nid && is_array($node->taxonomy) && !empty($node->taxonomy))  {
    foreach($node->taxonomy as $tid => $term) {
      if (in_array($term->tid, $tids)) {
        return TRUE;
      }
    }
  }

  // else we are not in this section
  return FALSE;
?>