Cache clearing in php website

Posted on 2014-11-19
Medium Priority
Last Modified: 2014-11-20
My website is looking different in different websites. Any update on CSS is not reflecting immediately in firefox but where as safari and chrome show the modification immediately.
Is there a way to add a code which clears the existing cache whenever the website loads and uses the latest style sheet.
Question by:karthik80c
LVL 37

Expert Comment

ID: 40452221
This is done either in the http server through the .htaccess file:

Header set Cache-Control "no-cache, no-store"

or through PHP:

header('Cache-Control: no-cache, no-store');
LVL 53

Expert Comment

ID: 40453359
However there is one big limitation; User Settings.  

You have no control over the user setting and the the browser will not refresh cache if the user settings explicitly prevent it;  unfortunately many users have restricted cache setting to optimize response time, especially if they are on a slow connection or use a lot of sites heavy on graphics or videos.


Author Comment

ID: 40454390
Thank you Computer and Coboldinosaur.
- then so what would be the best solution for this Coboldinosaur. Please let me know.

LVL 84

Accepted Solution

Dave Baldwin earned 1500 total points
ID: 40454534
When I change files that like CSS and javascript that are part of an HTML page, I often change the names of the files.  The browser usually will re-fetch the main page when it changes and if you have changed the names of the CSS and javascript files, even by a single character, they will fetched because the new names will not be in the cache.
LVL 53

Expert Comment

ID: 40455689
The solution Dave offers is a commonly used approach.  You can just add the version number to the new file.  The only drawback the approach has is if you are delivering static pages with the file names hard-coded; in which case you will need to change the file name on every page.


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