<?php
function markasread_menu($may_cache)
{
   $toreturn = array();
   if (!$may_cache)
   {
      $toreturn[] = array('path' => 'node/markasread',
            'title' => t('mark all content read'),
            'callback' => '_markasread',
            'access' => user_access('access content'),
            'type' => MENU_CALLBACK);
   }

   return $toreturn;
}

function _markasread()
{
   global $user;
   if ($user && $user->uid)
   {
      if (isset($_POST['edit']['tid']))
      {
         $tid = $_POST['edit']['tid'];
         if (is_numeric($tid) && $tid)
         {
            db_query("REPLACE INTO {history} (uid,nid,timestamp)
SELECT '%d',n.nid,UNIX_TIMESTAMP() FROM {node} n
INNER JOIN {term_node} r ON n.nid=r.nid
INNER JOIN {node_comment_statistics} l ON l.nid=n.nid
WHERE (n.created > '%d' OR l.last_comment_timestamp > '%d')
AND r.tid='%d'", $user->uid,NODE_NEW_LIMIT,NODE_NEW_LIMIT,$tid);
            drupal_goto("forum/$tid");
         }
         else
         {
            db_query("REPLACE INTO {history} (uid,nid,timestamp)
SELECT '%d',n.nid,UNIX_TIMESTAMP() FROM {node} n
INNER JOIN {node_comment_statistics} l ON l.nid=n.nid
WHERE (n.created > '%d' OR l.last_comment_timestamp > '%d')",
$user->uid,NODE_NEW_LIMIT,NODE_NEW_LIMIT);
            drupal_goto("forum");
         }
         print theme('page',"All content has been marked read");
      }
   }
   drupal_goto('forum');
}