When you force a download with PHP, you can use filename= in the Content-Disposition header to dynamically set the download's filename.
download_zip.php
$actual_file_name = '/var/yourserver/file.zip';
$download_file_name = substr(str_replace(array('\\/|>< ?%\"*'), '_', $_GET['title'] . '.zip'), 0, 255);
$mime = 'application/zip';
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: ' . $mime);
header('Content-Disposition: attachment; filename="'. $download_file_name .'"'); // Set it here!
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . filesize($actual_file_name));
header('Connection: close');
readfile($actual_file_name);
exit();
To get the page title of the last page, the easiest method would likely be passing the title as a $_GET variable in the download link. From the page with the download link:
<a href="http://yoursite.com/download_zip.php?title=The+Page+You+Were+Just+On">Download Zip File With This Page's Title</a>
This will require that you include your page title in the link, so to keep from updating the page title in two places, try using a $page_title variable. In the page with the download link:
<?php
$page_title = 'Page Title';
?>
<html>
<head>
<title><?= $page_title ?></title>
</head>
<body>
<a href="http://yoursite.com/download_zip.php?title=<?= urlencode($page_title) ?>">Download Zip File With This Page's Title</a>
</body>
</html>
