/**
* updates a single field in a users record
*
* @param string $fieldName name of the field to update
* @param string $fieldValue updated value for the field
* @param CriteriaElement $criteria {@link CriteriaElement} object or null
*
* @return bool TRUE if success or unchanged, FALSE on failure
*/
public function updateUsersByField($fieldName, $fieldValue, CriteriaElement $criteria = null)
{
if (is_null($criteria)) {
$criteria = new Criteria('');
// empty criteria resolves to 'WHERE (1)'
}
return $this->_uHandler->updateAll($fieldName, $fieldValue, $criteria);
}
