php add 30 days to datetime code example

Example 1: Add days to date in PHP

$date = new DateTime('2020-11-24');
$date->add(new DateInterval("P9D"));

echo $date->format('Y-m-d');

Example 2: php datetime add 1 weeek

$date = new DateTime();
$date->modify('+1 day');
$date->modify('+5 week');