redirect to login page after user is not activated on page

How to redirect to login page after user is not activated on page that means session end when user inactive for a 20 minutes.

pls give me example

[php]<?php
if (!isset($_SESSION[‘user’])) {
header(‘Location: /login.php’);
exit;
}

// rest of code here[/php]

Duplicate post. Previously asked and answered by Jim and myself

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