What are the best practices for compressing PHP files for download?

When downloading PHP files, it is important to compress them to reduce file size and speed up the download process. One way to do this is by using PHP's built-in zlib library to compress the file before sending it to the user. This can be achieved by using the ob_gzhandler() function to compress the output buffer before sending it to the browser.

<?php
ob_start("ob_gzhandler");

// Your PHP code here

ob_end_flush();
?>