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<?php

/// https://www.exchangecore.com/blog/sending-outlook-email-calendar-events-php

date_default_timezone_set('Europe/Paris');

///Central Europe Standard   CEST

function sendIcalEvent($from_name, $from_address, $to_name, $to_address, $startTime, $endTime, $subject, $description, $location)
{
    $domain = 'exchangecore.com';

//Create Email Headers
    $mime_boundary = "----Meeting Booking----".MD5(TIME());

$headers = "From: ".$from_name." <".$from_address.">\n";
    $headers .= "Reply-To: ".$from_name." <".$from_address.">\n";
    $headers .= "MIME-Version: 1.0\n";
    $headers .= "Content-Type: multipart/alternative; boundary=\"$mime_boundary\"\n";
    $headers .= "Content-class: urn:content-classes:calendarmessage\n";

//Create Email Body (HTML)
    $message = "--$mime_boundary\r\n";
    $message .= "Content-Type: text/html; charset=UTF-8\n";
    $message .= "Content-Transfer-Encoding: 8bit\n\n";
    $message .= "<html>\n";
    $message .= "<body>\n";
    $message .= '<p>Dear '.$to_name.',</p>';
    $message .= '<p>'.$description.'</p>';
    $message .= "</body>\n";
    $message .= "</html>\n";
    $message .= "--$mime_boundary\r\n";

$ical = 'BEGIN:VCALENDAR' . "\r\n" .
    'PRODID:-//Microsoft Corporation//Outlook 10.0 MIMEDIR//EN' . "\r\n" .
    'VERSION:2.0' . "\r\n" .
    'METHOD:REQUEST' . "\r\n" .
    'BEGIN:VTIMEZONE' . "\r\n" .
    'TZID:Central Europe Standard Time' . "\r\n" .
	
    //'TZID:Europe/Paris' . "\r\n" .
	
	
    'BEGIN:STANDARD' . "\r\n" .
    'DTSTART:20091101T020000' . "\r\n" .
    'RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11' . "\r\n" .
    'TZOFFSETFROM:+0300' . "\r\n" .
    'TZOFFSETTO:+0200' . "\r\n" .
    'TZNAME:CEST' . "\r\n" .
    'END:STANDARD' . "\r\n" .
    'BEGIN:DAYLIGHT' . "\r\n" .
    'DTSTART:20090301T020000' . "\r\n" .
    'RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3' . "\r\n" .
    'TZOFFSETFROM:+0300' . "\r\n" .
    'TZOFFSETTO:+0200' . "\r\n" .
    'TZNAME:CEST' . "\r\n" .
    'END:DAYLIGHT' . "\r\n" .
    'END:VTIMEZONE' . "\r\n" .  
    'BEGIN:VEVENT' . "\r\n" .
    'ORGANIZER;CN="'.$from_name.'":MAILTO:'.$from_address. "\r\n" .
    'ATTENDEE;CN="'.$to_name.'";ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:'.$to_address. "\r\n" .
    'LAST-MODIFIED:' . date("Ymd\TGis") . "\r\n" .
    'UID:'.date("Ymd\TGis", strtotime($startTime)).rand()."@".$domain."\r\n" .
    'DTSTAMP:'.date("Ymd\TGis"). "\r\n" .
    
	'DTSTART;TZID="Central Europe Standard Time":'.date("Ymd\THis", strtotime($startTime)). "\r\n" .
    'DTEND;TZID="Central Europe Standard Time":'.date("Ymd\THis", strtotime($endTime)). "\r\n" .
    
	//'DTSTART;TZID="Europe/Paris":'.date("Ymd\THis", strtotime($startTime)). "\r\n" .
    //'DTEND;TZID="Europe/Paris Standard Time":'.date("Ymd\THis", strtotime($endTime)). "\r\n" .
	
	
	'TRANSP:OPAQUE'. "\r\n" .
    'SEQUENCE:1'. "\r\n" .
    'SUMMARY:' . $subject . "\r\n" .
    'LOCATION:' . $location . "\r\n" .
    'CLASS:PUBLIC'. "\r\n" .
    'PRIORITY:5'. "\r\n" .
    'BEGIN:VALARM' . "\r\n" .
    'TRIGGER:-PT180M' . "\r\n" .
    'ACTION:DISPLAY' . "\r\n" .
    'DESCRIPTION:Reminder' . "\r\n" .
    'END:VALARM' . "\r\n" .
    'END:VEVENT'. "\r\n" .
    'END:VCALENDAR'. "\r\n";
    $message .= 'Content-Type: text/calendar;name="xxmeeting.ics";method=REQUEST'."\n";
    $message .= "Content-Transfer-Encoding: 8bit\n\n";
    $message .= $ical;

$mailsent = mail($to_address, $subject, $message, $headers);

//$mailsent = mail($to_address, $subject, "message" );

return ($mailsent)?(true):(false);
}

$from_name = "Site massage";        
	$from_address = "webmaster@example.com";        
	$to_name = "Le boulet...";        
	$to_address = "delpypatrice@gmail.com";        
	
	$to_address = "patrice.delpy@onsemi.com";        
	
	$startTime = "04/04/2020 10:00:00";         // 7
	$endTime = "04/04/2020 11:00:00";           // 8
	$subject = "Confirmation de votre réservation";        
	$description = "Massage";        
	$location = "Salle de repos";

$retour = sendIcalEvent($from_name, $from_address, $to_name, $to_address, $startTime, $endTime, $subject, $description, $location);

if($retour == true)
	{
		echo "BINGO.............";
	}
	else
	{
		echo "ERROR";
	}