Piwik\Twig::addFilter_percentage PHP Method

    protected function addFilter_percentage()
    {
        $percentage = new Twig_SimpleFilter('percentage', function ($string, $totalValue, $precision = 1) {
            $formatter = NumberFormatter::getInstance();
            return $formatter->formatPercent(Piwik::getPercentageSafe($string, $totalValue, $precision), $precision);
        });
        $this->twig->addFilter($percentage);
    }