What is the difference between using mktime() and date() functions in PHP for handling timestamps?

When handling timestamps in PHP, mktime() is used to create a Unix timestamp based on the provided parameters such as hour, minute, second, month, day, year, etc. On the other hand, date() function is used to format a Unix timestamp into a human-readable date string. So, mktime() is used to create timestamps, while date() is used to format timestamps into readable dates.

// Using mktime() to create a timestamp
$timestamp = mktime(12, 0, 0, 10, 15, 2022);

// Using date() to format the timestamp into a readable date
$formatted_date = date("Y-m-d H:i:s", $timestamp);

echo $formatted_date;