php解决Phpexcel导出效率慢的问题

数据4w+

function exportToExcel($filename, $tileArray=[], $dataArray=[]){
    ini_set('memory_limit','512M');
    ini_set('max_execution_time',0);
    ob_end_clean();
    ob_start();
    header("Content-Type: text/csv");
    header("Content-Disposition:filename=".$filename);
    $fp=fopen($filename,'w');
    fwrite($fp, chr(0xEF).chr(0xBB).chr(0xBF));//转码 防止乱码(比如微信昵称(乱七八糟的))
    fputcsv($fp,$tileArray);
    $index = 0;
    foreach ($dataArray as $item) {
        if($index==1000){
            $index=0;
            ob_flush();
            flush();
        }
        $index++;
        fputcsv($fp,$item);
    }

    ob_flush();
    flush();
    ob_end_clean();
}
$filePat = date('YmdHis',time()).rand(1111,9999);
$filenameh =  'uploads/'.$filePat.'.csv';
$a = exportToExcel($filenameh,$title,$data);
$request = Request::instance();
$domain=$request->domain();
$res =  $domain.'/uploads/'.$filePat.'.csv';
return json($res);