How can server-side deletion of variables in a script affect browser behavior, especially when using the F5 key for page refresh?

When server-side deletion of variables occurs in a script, it can lead to unexpected behavior in the browser, especially when using the F5 key for page refresh. This is because the browser may still have cached data that relies on those variables. To solve this issue, you can include cache-control headers in your PHP script to instruct the browser not to cache the page. 

<?php
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Pragma: no-cache"); // HTTP/1.0
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
?>

Keywords

PHP server-side variables browser behavior F5 key

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