What potential issue can arise when using sessions and the browser back button in PHP?

When using sessions and the browser back button in PHP, a potential issue that can arise is that the browser may cache the page and display outdated session data when navigating back. To solve this issue, you can add a no-cache header to prevent the browser from caching the page. 

<?php
session_start();

// Prevent caching of the page
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past

// Rest of your PHP code here
?>

Keywords

session browser back button caching session hijacking session fixation

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