What potential pitfalls should be considered when using mktime to generate timestamps in PHP?

When using mktime to generate timestamps in PHP, one potential pitfall to consider is the limitation of the function to represent dates within a certain range (from 13 December 1901 to 19 January 2038 on 32-bit systems). To avoid issues with dates outside this range, it is recommended to use the DateTime class, which has a wider range of supported dates.

// Using DateTime class to generate timestamps instead of mktime
$date = new DateTime('2022-12-31');
$timestamp = $date->getTimestamp();
echo $timestamp;