Convert seconds into days, hours, minutes and seconds

Question

I would like to convert a variable $uptime which is seconds, into days, hours, minutes and seconds.

Example:

Answer 1

foreach ($email as $temp => $value) {
    $dat = strtotime($value['subscription_expiration']); //$value come from mysql database
//$email is an array from mysqli_query()
    $date = strtotime(date('Y-m-d'));

    $_SESSION['expiry'] = (((($dat - $date)/60)/60)/24)." Days Left";
//you will get the difference from current date in days.
}

$value come from Database. This code is in Codeigniter. $SESSION is used for storing user subscriptions. it is mandatory. I used it in my case, you can use whatever you want.