What are the potential pitfalls of adding integers to date values in PHP?

When adding integers to date values in PHP, it's important to be aware that the date value might not behave as expected due to the different formats and calculations involved. To avoid potential pitfalls, it's recommended to use PHP's built-in date functions to manipulate dates accurately. One common mistake is assuming that adding a certain number of days to a date is as simple as adding that number to the day value, which can lead to incorrect results.

$date = "2022-01-01";
$days_to_add = 5;

$new_date = date('Y-m-d', strtotime($date . ' + ' . $days_to_add . ' days'));
echo $new_date;