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<?PHP
 
//$firstname is the first name of target
//$lastname is the last name of target
//$email is the targets email address
//$meeting_date is straight from a DATETIME mysql field and assumes UTC.
//$meeting_name is the name of your meeting
//$meeting_duretion is the duration of your meeting in seconds (3600 = 1 hour)
 
function sendIcalEmail($firstname,$lastname,$email,$meeting_date,$meeting_name,$meeting_duration)
{
 
	$from_name = "My Name";
	$from_address = "myname@mydomain.com";
	$subject = "Meeting Booking"; //Doubles as email subject and meeting subject in calendar
	$meeting_description = "Here is a brief description of my meeting\n\n";
	$meeting_location = "My Office"; //Where will your meeting take place
 
 
	//Convert MYSQL datetime and construct iCal start, end and issue dates
	$meetingstamp = STRTOTIME($meeting_date . " UTC");    
	$dtstart= GMDATE("Ymd\THis\Z",$meetingstamp);
	$dtend= GMDATE("Ymd\THis\Z",$meetingstamp+$meeting_duration);
	$todaystamp = GMDATE("Ymd\THis\Z");
 
	//Create unique identifier
	$cal_uid = DATE('Ymd').'T'.DATE('His')."-".RAND()."@mydomain.com";
 
	//Create Mime Boundry
	$mime_boundary = "----Meeting Booking----".MD5(TIME());
 
	//Create Email Headers
	$headers = "From: ".$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\n";
	$message .= "Content-Type: text/html; charset=UTF-8\n";
	$message .= "Content-Transfer-Encoding: 8bit\n\n";
 
	$message .= "<html>\n";
	$message .= "<body>\n";
	$message .= '<p>Dear '.$firstname.' '.$lastname.',</p>';
	$message .= '<p>Here is my HTML Email / Used for Meeting Description</p>';    
	$message .= "</body>\n";
	$message .= "</html>\n";
	$message .= "--$mime_boundary\n";
 
	//Create ICAL Content (Google rfc 2445 for details and examples of usage) 
	$ical =    'BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER:MAILTO:'.$from_address.'
DTSTART:'.$dtstart.'
DTEND:'.$dtend.'
LOCATION:'.$meeting_location.'
TRANSP:OPAQUE
SEQUENCE:0
UID:'.$cal_uid.'
DTSTAMP:'.$todaystamp.'
DESCRIPTION:'.$meeting_description.'
SUMMARY:'.$subject.'
PRIORITY:5
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR';   
 
	$message .= 'Content-Type: text/calendar;name="meeting.ics";method=REQUEST\n';
	$message .= "Content-Transfer-Encoding: 8bit\n\n";
	$message .= $ical;            
 
	//SEND MAIL
	$mail_sent = @MAIL( $email, $subject, $message, $headers );
 
	IF($mail_sent)     {
		RETURN TRUE;
	} ELSE {
		RETURN FALSE;
	}   
 
}
 
 
?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>iCal Test</title>
</head>
 
<body>
<?PHP
 
	//$firstname is the first name of target
	//$lastname is the last name of target
	//$email is the targets email address
	//$meeting_date is straight from a DATETIME mysql field and assumes UTC.
	//$meeting_name is the name of your meeting
	//$meeting_duration is the duration of your meeting in seconds (3600 = 1 hour)
	$firstname = "John";
	$lastname = "Smith";
	$email = "patrice.delpy@onsemi.com";
	$meeting_date = "2015-07-01 20:40:00"; //mysql format
	$meeting_name = "Hello";
	$meeting_duration = 3600;
 
	//returns true or false
	$result = sendIcalEmail($firstname,$lastname,$email,$meeting_date,$meeting_name,$meeting_duration);
 
	//display result
	IF($result) {
		ECHO "Email sent successfully.";
	} ELSE {
		ECHO "A problem occurred sending email";
	}   
 
?>
</body>
</html>