Wie kann ich PHP verwenden, um eine ical-Datei dynamisch zu veröffentlichen?

<?php

require_once 'iCalcreator.class.php';

// Create a new iCal instance
$ical = new vcalendar();

// Set the calendar properties
$ical->setProperty('method', 'PUBLISH');
$ical->setProperty("x-wr-calname", "My Calendar");
$ical->setProperty("X-WR-CALDESC", "Events for my calendar");
$ical->setProperty("X-WR-TIMEZONE", "UTC");

// Add an event
$event = &$ical->newComponent('vevent');
$event->setProperty('dtstart', '20221215T090000', ['VALUE' => 'DATE-TIME']);
$event->setProperty('dtend', '20221215T170000', ['VALUE' => 'DATE-TIME']);
$event->setProperty('summary', 'Christmas Day');
$event->setProperty('description', 'Celebrate Christmas with family and friends');
$event->setProperty('location', 'My House');

// Output the iCal file for download
header('Content-Type: text/calendar; charset=utf-8');
header('Content-Disposition: attachment; filename="calendar.ics"');
echo $ical->returnCalendar();

?>