Create an exporter

functions.php

<?php

header('Content-Encoding: Windows-1252');
header('Content-Type: text/csv; charset=Windows-1252');
header('Content-Disposition: attachment; filename='.$filename.'.csv' );//$filename as name of a file that will be downloaded
$output = fopen($filepath, 'w');//$filepath as path to the directory where the file will reside.
fputcsv($output, array('arrays of column header'));

fputcsv($output, $insert_array);
fclose($output);