What are the advantages and disadvantages of using mktime() in PHP for date and time calculations?

When using mktime() in PHP for date and time calculations, the advantage is that it allows you to easily create a Unix timestamp based on specific date and time values. However, the disadvantage is that mktime() does not account for daylight saving time or leap years, which can lead to inaccuracies in certain calculations.

// Example of using mktime() to calculate a future date
$future_date = mktime(0, 0, 0, date("m"), date("d") + 7, date("Y"));
echo "Future date: " . date("Y-m-d", $future_date);