How can timestamps be used to calculate the number of days between two dates in PHP?

To calculate the number of days between two dates in PHP using timestamps, you can first convert the dates into timestamps using the strtotime function. Then, subtract the timestamps of the two dates to get the time difference in seconds. Finally, divide the time difference by the number of seconds in a day (86400) to get the number of days.

$date1 = strtotime("2022-01-01");
$date2 = strtotime("2022-01-10");

$daysDifference = ($date2 - $date1) / 86400;

echo "Number of days between the two dates: " . $daysDifference;