Are there any specific PHP functions or methods that can simplify the process of working with timestamp ranges for calendar programming?

When working with timestamp ranges for calendar programming, it can be helpful to use PHP functions like `strtotime()` to convert date strings to timestamps, `date()` to format timestamps, and `strtotime()` to manipulate timestamps for calculating ranges. By utilizing these functions, you can easily work with date and time ranges in PHP.

// Example of calculating a timestamp range for a specific date range
$start_date = '2022-01-01';
$end_date = '2022-01-31';

$start_timestamp = strtotime($start_date);
$end_timestamp = strtotime($end_date);

// Loop through each day in the range
for ($i = $start_timestamp; $i <= $end_timestamp; $i += 86400) {
    echo date('Y-m-d', $i) . PHP_EOL;
}