How can browser cache issues contribute to unexpected behavior in PHP scripts?

Browser cache issues can contribute to unexpected behavior in PHP scripts because the browser may cache outdated versions of scripts or resources, leading to errors or incorrect functionality. To solve this issue, you can add cache-control headers to instruct the browser not to cache certain files or to set expiration dates for cached content.

// Prevent browser caching of PHP scripts
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");