Example of PHP5 + ICS | <a href="?output=mail&pwd=">Mail ICS</a> | <a href="?output=dl&pwd=">Download ICS</a> | <a href="?output=src&pwd=">Source</a> | <a href="./">Parent directory</a><hr/><pre>&lt;?php 

function censorEmails($str, $censor = true) {
	return $censor ? preg_replace('/[a-z_\d\.]+@[a-z_\d\.]+/i', 'censored@dev.null', $str): $str;
}

$loggedIn = ( md5($_REQUEST['pwd']) == '7a324f9caea77c896b6e20c72f45096f' );


if($_REQUEST['output'] != 'dl') { 
	echo 'Example of PHP5 + ICS | &lt;a href=&quot;?output=mail&amp;pwd='.$_REQUEST['pwd'].'&quot;&gt;Mail ICS&lt;/a&gt; | &lt;a href=&quot;?output=dl&amp;pwd='
        .$_REQUEST['pwd'].'&quot;&gt;Download ICS&lt;/a&gt; | &lt;a href=&quot;?output=src&amp;pwd='.$_REQUEST['pwd'].'&quot;&gt;Source&lt;/a&gt; | &lt;a href=&quot;./&quot;&gt;Parent directory&lt;/a&gt;&lt;hr/&gt;';
}

if( !$loggedIn &amp;&amp; $_REQUEST['output'] == 'mail') { echo 'Pwd?'; exit; }

if( $_REQUEST['output'] == 'src') {
	try {
        	echo '&lt;pre&gt;'.htmlspecialchars(censorEmails(file_get_contents(__FILE__),!$loggedIn)).'&lt;/pre&gt;';
	} catch (Exception $e) { echo $e-&gt;getMessage(); }
	exit;
}

$senderhost = 'ucm.energia.ee';
$sendingtime = date('Ymd\THi');
$uid='ID_120620';

$i = array(
	'to' =&gt; 'censored@dev.null',
	'subject' =&gt; 'Notes TODO #'.$uid.' @ '.$sendingtime,
        'xtraheaders' =&gt; 'From: censored@dev.null
Content-type: text/calendar',
	'message' =&gt; 'BEGIN:VCALENDAR
CALSCALE:GREGORIAN
PRODID:-//CGI Eesti//UCM2Notes v20130605//EN
VERSION:1.0
METHOD:REQUEST
BEGIN:VEVENT
ORGANIZER;CN=&quot;UCM&quot;:mailto:censored@dev.null
ATTENDEE;RSVP=YES;EXPECT=REQUEST:mailto:censored@dev.null
CREATED:20130605T093006Z
DTSTART;VALUE=DATE-TIME:20130615T150000Z
SUMMARY;CHARSET=UTF-8:Nõustumine dokumendiga '.$uid.'
DESCRIPTION;CHARSET=UTF-8:Kui olete nõus dokumendiga
   http://ucm-dev1/rc/idcplg?IdcService=DOC_INFO_BY_NAME&amp;RevisionSelectionMethod=Latest&amp;dDocName='.$uid.' ,
   vajutage [Accept], vastasel juhul [Decline].
UID:UCM2Notes!!'.$uid.'!'.mt_rand().'@ucm.energia.ee
TRANSP:1
STATUS:NEEDS ACTION
CATEGORIES:UCM
END:VEVENT
END:VCALENDAR
'
);

if($_REQUEST['output'] == 'dl') {
        header('Content-type: text/calendar; charset=UTF-8');
	header(&quot;Content-Disposition: attachment; filename=notestest_&quot;.date('YmdHis').&quot;.ics&quot;);
	echo censorEmails($i['message'], !$loggedIn);
        exit;
}

if($_REQUEST['output'] != 'mail') { exit; }

echo '&lt;pre&gt;';
var_export($i);
echo '&lt;/pre&gt;&lt;hr/&gt;';

$result = mail($i['to'],$i['subject'],$i['message'],$i['xtraheaders']);
echo 'Mail was sent: ';
var_export($result);

</pre>