How can the PHP script be modified to ensure that the timer continues from where it left off, regardless of how many times the page is accessed?

To ensure that the timer continues from where it left off regardless of how many times the page is accessed, you can store the timer value in a session variable. This way, the timer value will persist across page loads and the timer will resume from where it was last left off. 

<?php
session_start();

if(isset($_SESSION['timer'])) {
    $timer = $_SESSION['timer'];
} else {
    $timer = 0;
}

$timer++;

$_SESSION['timer'] = $timer;

echo "Timer: $timer";
?>

Keywords

PHP session variables time tracking page refresh persistence

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