What are the potential pitfalls of using PHP to detect if a user has clicked the back button?

One potential pitfall of using PHP to detect if a user has clicked the back button is that PHP is a server-side language and does not have direct access to client-side actions like button clicks. To overcome this limitation, you can use a combination of PHP and JavaScript. You can set a session variable in PHP when a user visits a page and then use JavaScript to check if the session variable exists when the user navigates back to the page. 

<?php
session_start();

if(isset($_SESSION['visited'])) {
    echo "Welcome back!";
} else {
    echo "Welcome!";
}

$_SESSION['visited'] = true;
?>

Keywords

PHP back button browser cache session management page redirection

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