PHP string date + 1 day equals?

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$date = date('d-m-Y', strtotime("+1 day", strtotime("10-12-2011")));

If you're trying to overwrite $date, Aaron's answer works great. But if you need the new day saved into a separate variable as I did, this works:

$date = strtotime('10-12-2011'); // your date
$newDate = date('d-m-Y', strtotime("+1 day", $date)); // day after original date