How to add a notification in a calendar

I've got a booking script. I'd like to get a notification in the bookers calendar, being it MS Outlook calendar, Google Calendar or any other popular caledar. I have very little experience in this field and seek basic "how to" information".
Serverside language: php.
Lennart EricsonAmateurAsked:
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Ray PaseurCommented:
There is a calendar standard called hCalendar that implements RFC2445.  Some other keywords of interest are iCal and vCal.  These use the iCalendar file format which is the defacto standard for calendar information interchange.  

You may be able to use PHP to force a download of a file with the ics file suffix.  The client's computer may associate the .ics files with a calendar program.  This file extension is used for calendaring and scheduling information.

The MIME type for iCalendar data is text/calendar.

I've done this in the past with an "add this event to my calendar" link.  The link went to a PHP script and it had a URL parameter giving a key to the calendar entry.  The PHP script used the key to locate the event row in the calendar database table.  It generated an iCalendar object, which is a simple text file like this (thanks, Wikipedia)
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
SUMMARY:Bastille Day Party

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If I can find a code example for this, I'll post it here and update these articles about handling date and time in PHP.
Ray PaseurCommented:
Here's the only example I can find, and it probably dates from about 15 years ago!  The code should be refactored (obviously) but the iCalendar object works correctly.  You can probably guess the calendar table structure from the variable names.  The "poc" means "point of contact."
error_reporting(E_ALL ^ E_NOTICE);

$_key = $_GET["k"];
if (!integer_string($_key)) die("Bad Key");

$filename = "LBBEvent" . $_key . ".vcs";
header("Content-Type: text/x-vCalendar");
header("Content-Disposition: inline; filename=$filename");

$sql = "SELECT * FROM calendar "WHERE _key = $_key LIMIT 1";
if (!$res = mysql_query($sql)) { query_error($sql); }
$num_rows = mysql_num_rows($res);

if ($num_rows == 0) {
    echo "Sorry, the <b>Event Key $_key</b> is not found in the calendar.<br /><br />\n";
    echo "Please report this error to the curator.<br /><br />\n";
    die("Sorry, Unable to add to your calendar.");
if ($num_rows != 1) {
    echo "SQL $sql<br>";
    echo "RESULT $result<br><br>";
    echo "The <b>Event Key $_key</b> appears to have $num_rows data base entries in the calendar (yikes!)<br />\n";
    echo "Please report this error to the curator.<br /><br />\n";
    die("Sorry, Unable to add to your calendar.");

$calendar_array = mysql_fetch_assoc($res);

$loc = trim($location);
if ($loc  != '') { $loc  = '=0D=0A=Location: ' . $loc; }

$poc1 = trim($poc1_name .' '. $poc1_phone .' '. $poc1_email);
if ($poc1 != '') { $poc1 = '=0D=0A=Contact: ' . $poc1; }

$poc2 = trim($poc2_name .' '. $poc2_phone .' '. $poc2_email);
if ($poc2 != '') { $poc2 = '=0D=0A=Contact: ' . $poc2; }

$pocw = trim($poc_url);
if ($pocw != '') { $pocw = '=0D=0A=WWW: ' . $pocw; }

$poc = $poc1 . $poc2 . $pocw;

$vcal_dtstart = date('Y-m-d H:i:sO', strtotime($start));
$vcal_dtend   = date('Y-m-d H:i:sO', strtotime($end));
if ($vcal_dtend < $vcal_dtstart) { $vcal_dtend = $vcal_dtstart; }

PRODID:LBB Online Calendar
SUMMARY:<?php echo "$title" . "\n"; ?>
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:<?php echo "$details" . "$loc" . "$poc" . "\n"; ?>
DTSTART:<?php echo $vcal_dtstart . "\n"; ?>
DTEND:<?php echo $vcal_dtend . "\n"; ?>

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Lennart EricsonAmateurAuthor Commented:
Thank you! Sorry for not having responded eaarlier.
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