How can PHP be used to calculate the current date plus one day?

To calculate the current date plus one day in PHP, you can use the `DateTime` class to get the current date and then add one day to it using the `modify` method. Finally, you can format the resulting date in the desired format using the `format` method.

$currentDate = new DateTime();
$currentDate->modify('+1 day');
$nextDay = $currentDate->format('Y-m-d');
echo $nextDay;