How can you prevent images from being reloaded when using the F5 key in PHP?

When a user presses the F5 key to refresh a webpage, all the resources on that page, including images, are reloaded. To prevent images from being reloaded when using the F5 key in PHP, you can set appropriate cache headers for the images. By setting the cache-control header to a value that allows the browser to cache the images, you can ensure that they are not reloaded unnecessarily.

<?php
header("Cache-Control: max-age=3600"); // Set cache-control header to cache images for 1 hour
?>