How to create Outlook meeting request with PHP

I needed to develop a module to a PHP application in which an invitation is sent to two or more participants who use Microsoft Outlook.

// How to create outlook meeting request with PHP
// If you don't use exchange server, the message arrives as ics attachment.

<?php

	$to = 'boushh@arturito.net,bobafett@arturito.net';
	$subject = "Millennium Falcon";
	
	$organizer 			= 'Darth Vader';
	$organizer_email	= 'darthvader@arturito.net';
	
	$participant_name_1	= 'Boushh';
	$participant_email_1= 'boushh@arturito.net';
	
	$participant_name_2	= 'Boba Fett';
	$participant_email_2= 'bobafett@arturito.net';	
	
	$location 			= "Stardestroyer-013";
    $date     			= '20131026';
    $startTime			= '0800';
    $endTime			= '0900';
    $subject			= 'Millennium Falcon';
    $desc				= 'The purpose of the meeting is to discuss the capture of Millennium Falcon and its crew.';

	$headers = 'Content-Type:text/calendar; Content-Disposition: inline; charset=utf-8;\r\n';
	$headers .= "Content-Type: text/plain;charset=\"utf-8\"\r\n"; #EDIT: TYPO

    $message = "BEGIN:VCALENDAR\r\n
    VERSION:2.0\r\n
    PRODID:-//Deathstar-mailer//theforce/NONSGML v1.0//EN\r\n
	METHOD:REQUEST\r\n
    BEGIN:VEVENT\r\n
    UID:" . md5(uniqid(mt_rand(), true)) . "example.com\r\n
    DTSTAMP:" . gmdate('Ymd').'T'. gmdate('His') . "Z\r\n
    DTSTART:".$date."T".$startTime."00Z\r\n
    DTEND:".$date."T".$endTime."00Z\r\n
    SUMMARY:".$subject."\r\n
	ORGANIZER;CN=".$organizer.":mailto:".$organizer_email."\r\n
	LOCATION:".$location."\r\n
	DESCRIPTION:".$desc."\r\n
	ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN".$participant_name_1.";X-NUM-GUESTS=0:MAILTO:".$participant_email_1."\r\n
	ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN".$participant_name_2.";X-NUM-GUESTS=0:MAILTO:".$participant_email_2."\r\n
	END:VEVENT\r\n
    END:VCALENDAR\r\n";

	$headers .= $message;
	mail($to, $subject, $message, $headers);	
?>	

The message will arrive appear in Outlook like this:

If you don’t use exchange server, the message arrives as ics attachment.

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