Are there alternative methods or APIs that PHP developers can consider for integrating calendar functionality on a website, apart from Google Calendar API?

When looking for alternative methods or APIs for integrating calendar functionality on a website apart from Google Calendar API, PHP developers can consider using libraries like FullCalendar or PHP iCalendar. These libraries provide a range of features for displaying and managing events on a calendar within a PHP application.

// Example using FullCalendar library
// Include FullCalendar library
require 'fullcalendar/vendor/autoload.php';

// Initialize FullCalendar
$calendar = new FullCalendar\Calendar();

// Add events to the calendar
$calendar->addEvent(new FullCalendar\Event([
    'id' => '1',
    'title' => 'Event 1',
    'start' => '2023-01-01',
    'end' => '2023-01-02'
]));

// Render the calendar
echo $calendar->getCalendar();