Convert an array to a csv file

download-csv.php

<?php
$filename = 'report_period_' . date('Y-m-d', $time) . '.csv';
$file = sys_get_temp_dir() . '/' .  $filename;
$fp = fopen($file, 'w');
foreach ($csvData as $r) {
    fputcsv($fp, $r);
}
fclose($fp);

$size_in_bytes = filesize($file);

$ContentType = 'Content-type: application/vnd.ms-excel';
$ContentLength = "Content-Length: $size_in_bytes";
$ContentDisposition = "Content-Disposition: attachment; filename=\"$filename\"";

header($ContentType);
header($ContentLength);
header($ContentDisposition);
readfile($file);