What is the issue with the date output in the PHP script provided?
The issue with the date output in the PHP script is that the format 'd/m/Y' is being used with the 'strtotime' function which expects a different format. To fix this, we can use the 'date_create' function to create a DateTime object and then format it using the 'format' method with the desired format.
$date = "25/12/2022";
$datetime = date_create_from_format('d/m/Y', $date);
echo $datetime->format('Y-m-d');