How can time() and mktime() be used to determine the remaining days between two dates in PHP?

To determine the remaining days between two dates in PHP, you can use the time() and mktime() functions to calculate the difference in seconds between the two dates. You can then convert this difference into days by dividing by the number of seconds in a day (86400). Finally, you can output the remaining days.

$future_date = mktime(0, 0, 0, 12, 31, 2022); // Future date in Unix timestamp
$current_date = time(); // Current date in Unix timestamp

$remaining_seconds = $future_date - $current_date;
$remaining_days = floor($remaining_seconds / 86400);

echo "Remaining days until December 31, 2022: " . $remaining_days;