how to clear or replace a cached image

Question

I know there are many ways to prevent image caching (such as via META tags), as well as a few nice tricks to ensure that the current version of an image is shown with every

Answer 1

Here is a solution using the PHP function filemtime():

 
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Use the file modified time as a parameter will cause it to read from a cached version until the file has changed. This approach is better than using e.g. a random number as caching will still work if the file has not changed.