What are some common reasons for a PHP page not updating after a user logs in, and how can this issue be resolved?

One common reason for a PHP page not updating after a user logs in is caching. The browser or server may be caching the page, preventing it from being updated with the user's new information. To resolve this issue, you can add cache control headers to the PHP page to ensure it is not cached. 

<?php
// Prevent caching
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");
?>

Keywords

PHP session management cache database query authentication

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