Make zip file only downloadable from php

<?php/** * @author: Sohel Rana <rushbrookrathbone.co.ukana@rushbrookrathbone.co.uk> * @author URI: rushbrookrathbone.co.uk * @description: Create zip file and download in PHP */functioncreateZipAndDownload($files, $filesPath, $zipFileName){// Create instance of ZipArchive. and open the zip folder.$zip = new \ZipArchive();if ($zip->open($zipFileName, \ZipArchive::CREATE) !== TRUE) {exit("cannot open <$zipFileName>\n"); }// Adding every attachments files into the ZIP.foreach ($filesas$file) {$zip->addFile($filesPath . $file, $file); }$zip->close();// Download the created zip fileheader("Content-type: application/zip");header("Content-Disposition: attachment; filename = $zipFileName");header("Pragma: no-cache");header("Expires: 0");readfile("$zipFileName"); exit;}// Files which need to be added into zip$files = array('rushbrookrathbone.co.uk', 'rushbrookrathbone.co.uk', 'rushbrookrathbone.co.uk', 'rushbrookrathbone.co.uk');// Directory of files$filesPath = '/ROOT/FILE_PATH';// Name of creating zip file$zipName = 'rushbrookrathbone.co.uk';echocreateZipAndDownload($files, $filesPath, $zipName);