how to stop php countdown timer at zero

Question

I want to stop my php countdown timer to stop at 00:00:00:00

here is my code

$due_date = strtotime('July 4, 2014 10:33 PM');
$rem = $due_date - time();
$day = floor($rem / 86400);
$hr  = floor(($rem % 86400) / 3600);
$min = floor(($rem % 3600) / 60);
$sec = ($rem % 60);
echo "$day Days $hr Hours $min Minutes $sec Seconds Remaining...";

but it runs further to -1 and so on in minus values.

i dont want it, I want to stop it at zeros. So I can echo my any msg when it stops at zero. any idea how to do it?

many thanks in advance.

Answer 1

$due_date = strtotime('July 4, 2014 00:33 PM');

if($due_date > time()) {
    $rem = $due_date - time();
    $day = floor($rem / 86400);
    $hr  = floor(($rem % 86400) / 3600);
    $min = floor(($rem % 3600) / 60);
    $sec = ($rem % 60);
    echo "$day Days $hr Hours $min Minutes $sec Seconds Remaining..."; // Timer still has time to go.
} else {
    echo "0 Days 0 Hours 0 Minutes 0 Seconds Remaining..."; // Timer is finished, now at 00:00:00
}