PHP force refresh image

Add the modified date to the end of the image as a query.

<img src="/images/photo.png?=1239293"/>

In PHP

<img src="/images/photo.png?=<?php echo filemtime($filename)?>"/>

In PHP you can send a random number or the current timestamp:

<img src="image.jpg?<?=Date('U')?>">

<img src="image.jpg?<?=rand(1,32000)?>">

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