What are the potential pitfalls of relying on browser caching for PHP scripts and how can they be avoided?

Relying solely on browser caching for PHP scripts can lead to outdated content being served to users, as the browser may not always fetch the latest version of the script. To avoid this issue, you can set appropriate caching headers in your PHP script to control how the browser caches the content.

// Set caching headers to ensure the browser fetches the latest version of the script
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");