php如何导出几十万数据到excel中

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public function exportData($headRowArray, $dataArray, $exportFilename = '1111')
    {
        $header = array_values($headRowArray);

        header("Content-type:text/csv;charset=utf-8");
        header("Content-Disposition:attachment;filename={$exportFilename}.csv");
        header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
        header('Expires:0');
        header('Pragma:public');

        $fp = fopen('php://output', 'w');
        fwrite($fp, chr(0xEF).chr(0xBB).chr(0xBF));
        fputcsv($fp, $header);





        $total = count($dataArray);
        $limit = 5000 ;
        $page_num = ceil ( $total / $limit ) ;
        for ( $i = 0 ; $i <= $page_num ; $i ++ ) {
            $out_put_data = array_slice ( $dataArray , $limit * $i , $limit ) ;
            foreach ( $out_put_data as $dataRowArray ) {
                $data = array_map(function($item){return "\t".$item;},$data);
                fputcsv($fp, $data);
            }

            ob_flush () ;
            flush () ;
            sleep(1);
        }
        fclose($fp);
        exit;
    }

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