Is there a way to force browsers to refresh/download images?

Question

I have a problem where users are reporting that their images aren\'t being uploaded and the old ones are still there. On closer inspection the new images are there, they jus

Answer 1

Go Random. Just use some random number and append it with image filename.

<img src="image.jpg?<?=rand(1,1000000)?>">

Answer 2

My favourite PHP solution:

<img src="<?php echo "image.jpg" . "?v=" . filemtime("image.jpg"); ?>" />

every change of file "create" a new version of the file