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

    protected function renderCsv()
    {
        $file = fopen('php://output', 'w');
        header('Content-Type: text/csv');
        header('Content-Disposition: attachment; filename="' . $this->getFileName() . '"');
        header('Pragma: no-cache');
        set_time_limit(0);
        /** @var $provider DataProvider */
        $provider = $this->grid->getConfig()->getDataProvider();
        $this->renderHeader($file);
        $this->resetPagination($provider);
        $provider->reset();
        /** @var DataRow $row */
        while ($row = $provider->getRow()) {
            $output = [];
            foreach ($this->grid->getConfig()->getColumns() as $column) {
                if (!$column->isHidden()) {
                    $output[] = $this->escapeString($column->getValue($row));
                }
            }
            fputcsv($file, $output, static::CSV_DELIMITER);
        }
        fclose($file);
        exit;
    }