How can cookies affect the display of new posts after a refresh in a PHP forum?

Cookies can affect the display of new posts after a refresh in a PHP forum by storing outdated information that is being used to render the page. To solve this issue, you can set the cache-control header to prevent the browser from caching the page and force it to fetch the latest content from the server. 

<?php
header("Cache-Control: no-cache, must-revalidate"); // Prevent caching of the page
?>

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cookies display new posts refresh PHP forum

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