/**
  * Return a particular LDAP user by objectGUID value.
  *
  * @param string $guid
  * @return array
  */
 public function getUserByGUID($guid, $baseDn = null, $scope = Zend\Ldap\Ldap::SEARCH_SCOPE_SUB, $attributes = array())
 {
     return $this->search(sprintf('(&(objectClass=user)(objectGUID=%s))', LDAPUtil::str_to_hex_guid($guid, true)), $baseDn, $scope, $attributes);
 }