}
else {
// We need to upper case because PHP index matches are case sensitive but
- // do not need the more expensive Unicode::strtoupper() because SQL statements are ASCII.
+ // do not need the more expensive mb_strtoupper() because SQL statements
+ // are ASCII.
$operator = strtoupper($operator);
$return = isset(static::$conditionOperatorMap[$operator]) ? static::$conditionOperatorMap[$operator] : [];
}