Piwik\ViewDataTable\Config::setDefaultColumnsToDisplay PHP Method

    public function setDefaultColumnsToDisplay($columns, $hasNbVisits, $hasNbUniqVisitors)
    {
        if ($hasNbVisits || $hasNbUniqVisitors) {
            $columnsToDisplay = array('label');
            // if unique visitors data is available, show it, otherwise just visits
            if ($hasNbUniqVisitors) {
                $columnsToDisplay[] = 'nb_uniq_visitors';
            } else {
                $columnsToDisplay[] = 'nb_visits';
            }
        } else {
            $columnsToDisplay = $columns;
        }
        $this->columns_to_display = array_filter($columnsToDisplay);
    }