缓存动态GD映像

Question

How would I cache a image that may change every few minutes so it is only generated, lets say, once a hour?

I was told something like this?

                header('Content-type: image/png');
                header("Cache-Control: private, max-age=10800, pre-check=10800");
                header("Pragma: private");
                header("Expires: " . date(DATE_RFC822,strtotime(" 1 hour")));

But it does update with every change, which I'm not sure if that mean it's not caching or changes overwrite the cache?

I tried looking through some other topics but they didn't address my specific issue, or linked to dead pages.

Answer 1

I highly recommend SLIR (Smart Lencioni Image Resizer). It's found here:

https://github.com/lencioni/SLIR

Among other wonderful abilities (on the fly/dynamic resizing, auto-crop, etc.), it caches all rendered images for the length of time you provide in its config file.