PHP date; How to find the next year?

From PHP's documentation:

<?php
    $date = new DateTime($your_supposed_date);
    $date->add(new DateInterval('P1Y'));
    echo $date->format('Y-m-d') . "\n";
?>

Gordon's much cleaner version (Thank you!):

<?php
    $date = new DateTime("+12 months $theDate");
    echo $date->format('Y-m-d') . "\n";
?>

echo date('Y', strtotime('+1 year'));

$Ad_year = 2015-10-20
<?php echo $Ad_year + 1?>
Result 2016

You can use strtotime and date

$date = '2010-09-16';
echo date('Y-m-d', strtotime("+12 months $date"));
// 2011-09-16

_{On a sidenote: DateTime questions like this have been answered over and over again, so you could have found how to add to a date easily by using the search function.}