<?php

class CSVHelper{
    public function writeCSV($filename, $headings, $data) {
        $newTab = ",";
        $newLine = "\n";

        $fputcsv = count($headings) ? '"' . implode('"' . $newTab . '"', $headings) . '"' . $newLine : '';

        // Loop over the * to export
        if (!empty($data)) {
            foreach ($data as $item) {
                $fputcsv .= '"' . implode('"' . $newTab . '"', $item) . '"' . $newLine;
            }
        }

        //Convert CSV to UTF-16
        // $encoded_csv = mb_convert_encoding($fputcsv, 'UTF-16LE', 'UTF-8');
        // Output CSV-specific headers
        header('Set-Cookie: fileDownload=true; path=/'); //This cookie is needed in order to trigger the success window.
        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Cache-Control: private", false);
        header("Content-Type: application/octet-stream");
        header("Content-Disposition: attachment; filename=\"$filename.csv\";");
        header("Content-Transfer-Encoding: binary");
        header('Content-Length: ' . strlen($fputcsv));
        echo $fputcsv; //php array convert to csv/excel
    }

}