如何缓存图像一年，但html / php只有24小时

Question

I'm new here so sorry if this is in the wrong category or something like that. Now getting to my problem. I have a website: www.windowstaan.pe.hu which also opens on a mobile app so in order to make it load fast I have enabled caching in .htaccess and here's its code:

## EXPIRES CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 day"
ExpiresByType text/html "access 1 day"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>
## EXPIRES CACHING ##

Now what happens here is that any page I load in the browser can also be loaded offline which is what I wanted, but if I make any changes to the html then I'm not sure how its going to update here.

My html files are saved as index.php, PHP because they have some PHP code in them mainly include header, footer and a small mysql line.

Now what I want is for this homepage and every other html/php page to reload every day.

Please tell me what I need to do in .htaccess to set it like that.

I have tried setting html / css to 1 day there but that is not working perfectly as my app still loads the old cache. (My app is just a browser of windowsphone 8.1, IE11 probably.)

Thanks in advance.

Answer 1

The browser caching will base on the resource URL.

When you want to force browser to reload the new resource, you just change the URL by adding a version string.

For example, current image URL:

http://static.adzerk.net/Advertisers/af217662e49a4cbda030feae88418cdd.png

You can change to:

http://static.adzerk.net/Advertisers/af217662e49a4cbda030feae88418cdd.png?v=1

The version number can be controlled in your PHP code.

Version control number can be read/write from a text file in case you do not use DB.