function sess_write

File

includes/session.inc, line 57

User session handling functions.

Code

function sess_write($key, $value) {
  global $user;

  // If saving of session data is disabled or if the client doesn't have a session,
  // and one isn't being created ($value), do nothing. This keeps crawlers out of
  // the session table. This reduces memory and server load, and gives more useful
  // statistics. We can't eliminate anonymous session table rows without breaking
  // the throttle module and the "Who's Online" block.
  if (!session_save_session() || $user->uid == 0 && empty($_COOKIE[session_name()]) && empty($value)) {
    return TRUE;
  }
  db_query("UPDATE {sessions} SET uid = %d, cache = %d, hostname = '%s', session = '%s', timestamp = %d WHERE sid = '%s'", $user->uid, isset($user->cache) ? $user->cache : '', $_SERVER["REMOTE_ADDR"], $value, time(), $key);
  if (db_affected_rows()) {

    // TODO: this can be an expensive query. Perhaps only execute it every x minutes. Requires investigation into cache expiration.
    if ($user->uid) {
      db_query("UPDATE {users} SET access = %d WHERE uid = %d", time(), $user->uid);
    }
  }
  else {

    // If this query fails, another parallel request probably got here first.
    // In that case, any session data generated in this request is discarded.
    @db_query("INSERT INTO {sessions} (sid, uid, cache, hostname, session, timestamp) VALUES ('%s', %d, %d, '%s', '%s', %d)", $key, $user->uid, isset($user->cache) ? $user->cache : '', $_SERVER["REMOTE_ADDR"], $value, time());
  }
  return TRUE;
}