How can the mktime() function be used to calculate the difference between two dates in PHP?

To calculate the difference between two dates in PHP using the mktime() function, you can first convert the dates to Unix timestamps using mktime(), then subtract the timestamps to get the difference in seconds. You can then convert this difference to days, hours, minutes, etc. as needed.

$date1 = mktime(0, 0, 0, 1, 1, 2022); // First date
$date2 = mktime(0, 0, 0, 1, 10, 2022); // Second date

$difference = $date2 - $date1; // Difference in seconds

$days = floor($difference / (60 * 60 * 24)); // Convert difference to days

echo "The difference between the two dates is $days days.";