I have sessions working to a postgresql database. To test out what happens during a failure, I replaced the calls to _read and _write in the custom save handler to always return false. How can I tell if sessions are working correctly? session_start() always returns true (I thought it would return false as my _write handler was always returning false).

Here's the session handler code:

function pgsql_session_open($save_path, $session_name)
{
  return false;
}

function pgsql_session_close()
{
  return false;
}

function pgsql_session_read($key)
{
  return false;
}

function pgsql_session_write($key, $val)
{
  return false;
}

function pgsql_session_destroy($key)
{
  return false;
}

function pgsql_session_gc($maxlifetime)
{
  return false;
}

session_set_save_handler(
    'pgsql_session_open',
    'pgsql_session_close',
    'pgsql_session_read',
    'pgsql_session_write',
    'pgsql_session_destroy',
    'pgsql_session_gc'
);