Piwik\Common::mb_strtolower PHP Method

    public static function mb_strtolower($string)
    {
        if (function_exists('mb_strtolower')) {
            return mb_strtolower($string, 'UTF-8');
        }
        return strtolower($string);
    }

 private function getTranslationForComparison($operand, $segmentType)
 {
     $operator = $operand[SegmentExpression::INDEX_OPERAND_OPERATOR];
     $translation = $operator;
     if ($operator === SegmentExpression::MATCH_IS_NULL_OR_EMPTY) {
         return Piwik::translate('SegmentEditor_SegmentOperatorIsNullOrEmpty');
     }
     if ($operator === SegmentExpression::MATCH_IS_NOT_NULL_NOR_EMPTY) {
         return Piwik::translate('SegmentEditor_SegmentOperatorIsNotNullNorEmpty');
     }
     if ($segmentType === 'dimension' && !empty($this->matchesDimension[$operator])) {
         $translation = Piwik::translate($this->matchesDimension[$operator]);
     }
     if ($segmentType === 'metric' && !empty($this->matchesMetric[$operator])) {
         $translation = Piwik::translate($this->matchesMetric[$operator]);
     }
     return Common::mb_strtolower($translation);
 }