How can PHP functions like date_create and mktime be used effectively for timestamp conversions?

When working with timestamps in PHP, functions like date_create and mktime can be used effectively for timestamp conversions. Date_create can be used to create a new DateTime object from a given date string, while mktime can be used to create a Unix timestamp from a specific date and time. By utilizing these functions, you can easily convert timestamps between different formats and perform various operations on them.

// Example of using date_create to convert a date string to a timestamp
$dateString = '2022-01-01';
$timestamp = date_create($dateString)->getTimestamp();
echo $timestamp;

// Example of using mktime to create a timestamp from a specific date and time
$timestamp = mktime(12, 0, 0, 1, 1, 2022);
echo $timestamp;