How can the behavior of the back button in a browser be controlled to ensure that the user returns to the previous page with the same scroll position in PHP?

When a user navigates back to a previous page using the browser's back button, the scroll position is usually reset to the top of the page. To control this behavior and ensure that the user returns to the previous page with the same scroll position, you can use JavaScript to store the scroll position in a session variable and then set the scroll position back to that value when the user returns to the page. 

<?php
session_start();

if(isset($_SESSION['scroll_position'])){
    echo '<script>window.scrollTo(0,' . $_SESSION['scroll_position'] . ');</script>';
}

if(isset($_POST['save_scroll_position'])){
    $_SESSION['scroll_position'] = $_POST['scroll_position'];
}

?>

<!DOCTYPE html>
<html>
<head>
    <title>Scroll Position Control</title>
</head>
<body>
    <form method="post">
        <input type="hidden" name="scroll_position" value="<?php echo $_POST['scroll_position']; ?>">
        <button type="submit" name="save_scroll_position">Save Scroll Position</button>
    </form>
</body>
</html>

Keywords

PHP browser back button scroll position control

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