How can timestamps be generated from date and time data in PHP to facilitate sorting?

When working with date and time data in PHP, timestamps can be generated using the strtotime() function. This converts a date/time string into a Unix timestamp, which is a numeric representation of a specific date and time. By converting dates and times to timestamps, it becomes easier to sort and compare them in PHP, as timestamps are simply integers that can be compared numerically.

$date = "2022-01-15";
$time = "13:45:00";

$timestamp = strtotime($date . " " . $time);

echo $timestamp;