How to disable browser back button and refresh button

Question

Hi How to disable browser back button and refresh button when the exam is started? can you please provide me the solution for this!!!

Dipankar Biswas · Answer

You can't disable Back button with PHP. You can disable caching using something like this: header(Cache-Control: no-cache must-revalidate); // HTTP/1.1 header(Expires: Sat 26 Jul 1997 05:00:00 GMT); // DATE in the past ?> This will add the appropriate headers to the HTTP request to inform the browser it should reload the page instead of fetching it through a cache.