Are there any specific PHP functions or libraries recommended for handling holiday calculations and display in a calendar?

When working with holiday calculations and display in a calendar using PHP, it is recommended to use the `Carbon` library for date manipulation and calculations. This library provides a convenient way to work with dates and times, making it easier to handle holidays and display them in a calendar.

// Include the Carbon library
require 'vendor/autoload.php';

use Carbon\Carbon;

// Get the current year
$currentYear = Carbon::now()->year;

// Define an array of holidays
$holidays = [
    Carbon::create($currentYear, 1, 1), // New Year's Day
    Carbon::create($currentYear, 12, 25), // Christmas Day
    // Add more holidays as needed
];

// Display holidays in a calendar
echo "<h2>Holidays in $currentYear:</h2>";
echo "<ul>";
foreach ($holidays as $holiday) {
    echo "<li>{$holiday->format('F j')}</li>";
}
echo "</ul>";