Nayjest\Grids\Components\CsvExport::renderHeader PHP Method

    protected function renderHeader($file)
    {
        $output = [];
        foreach ($this->grid->getConfig()->getColumns() as $column) {
            if (!$column->isHidden()) {
                $output[] = $this->escapeString($column->getLabel());
            }
        }
        fputcsv($file, $output, static::CSV_DELIMITER);
    }