Are there any best practices for efficiently calculating workdays in PHP without having to manually calculate each holiday in Germany?

When calculating workdays in PHP for Germany, it is best to use a library or API that includes a list of public holidays in Germany. This can help avoid manually calculating each holiday and ensure accuracy in determining workdays. One popular library that can be used for this purpose is "Carbon" which provides a simple and efficient way to handle dates and holidays.

// Install Carbon library using Composer
// composer require nesbot/carbon

use Carbon\Carbon;

// Set the timezone to Germany
Carbon::setLocale('de_DE');

// Calculate the number of workdays between two dates
function calculateWorkdays($startDate, $endDate) {
    $workdays = 0;
    
    $currentDate = Carbon::parse($startDate);
    $endDate = Carbon::parse($endDate);
    
    while ($currentDate <= $endDate) {
        if ($currentDate->isWeekday() && !$currentDate->isHoliday()) {
            $workdays++;
        }
        
        $currentDate->addDay();
    }
    
    return $workdays;
}

// Example usage
$startDate = '2023-01-01';
$endDate = '2023-01-31';

echo calculateWorkdays($startDate, $endDate); // Output: 22