add 1 day php datetime

$start_date = "2015/03/02";  
$date = strtotime($start_date);
$date = strtotime("+7 day", $date);
echo date('Y/m/d', $date);

$date&nbsp;=&nbsp;new&nbsp;DateTime('2000-01-01');
$date-&gt;add(new&nbsp;DateInterval('P1D'));

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