What role do cache headers play in resolving image display issues on a PHP forum?

When images on a PHP forum are not displaying correctly, it could be due to browser caching issues. By setting proper cache headers in the PHP script, we can control how long browsers should cache the images. This ensures that the latest version of the images is always loaded, resolving display problems. 

<?php
// Set cache headers to prevent browser caching issues
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
?>

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cache headers image display PHP forum resolving technical keywords

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