Question

The issue is, every browser used to store cache of webpages, and whenever I update my webpage from the server, I can not see the updating until I perform refreshing of that page or clear the cache.
So, this is a big problem for users/guests, for example, the visitor visits my webpage today, and I update my webpage that has important news, Whenever he will visit again, he will be unable to see the updating due to already stored cache on his/her system. Until he/she refresh the page or clear cache of the browser, the updating will be hidden.

Is there any solution of this issue ? because mostly no body used to refresh the page or good at clearing the cache. So, any idea how to solve it?

or If I am not wrong, can I do that when the visitor leaves my webpage, the cache of only my webpage deleted/cleared. Any php code, script or anything ?

Thanks.

Answer 1

Using PHP :

if( !headers_sent() )
    {   header('Expires: ' . gmdate('D, d M Y H:i:s') . 'GMT');
        header('Cache-control: no-cache');
    }

Using HTML :

<META HTTP-EQUIV="Expires" CONTENT="Tue, 04 Dec 1993 21:29:02 GMT">

You can’t clean clients cache but you can make it expire at specific time.