php export csv file

ExportCsv.php

function exportCSV($filename, $data)
{
    header('Content-Encoding: UTF-8');
    header('Content-type: text/csv; charset=UTF-8');
    header("Content-Disposition:attachment;filename=".$filename);
    header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
    header('Expires:0');
    header('Pragma:public');
    echo "\xEF\xBB\xBF"; // UTF-8 BOM
    echo $data;
}