function.create_iCal_file.php

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<?php
 
// include secure.php to protect this file and the whole CMS!
if(!defined("SEC_FILE")){define("SEC_FILE",'/framework/secure.php' );}
if (defined('LEPTON_PATH')) {   
    include LEPTON_PATH.SEC_FILE;
} else {
    $oneback = "../";
    $root = $oneback;
    $level = 1;
    while (($level < 10) && (!file_exists($root.SEC_FILE))) {
        $root .= $oneback;
        $level += 1;
    }
    if (file_exists($root.SEC_FILE)) { 
        include $root.SEC_FILE;  
    } else {
        trigger_error(sprintf("[ <b>%s</b> ] Can't include secure.php!", $_SERVER['SCRIPT_NAME']), E_USER_ERROR);
    }
}
// end include secure file
 
 
function create_iCal_file(
    string $title,
    string $location = 'Anywhere',
    string $startdate = '2025-01-01',
    string $starttime = '10:30:00',
    string $enddate = '2025-01-01',
    string $endtime = '12:00:00',
    string $description = 'Description',
    string $reminder = '60',
    string $reminder_text = 'Reminder', 
    string $filename = LEPTON_PATH.MEDIA_DIRECTORY.'/event.ics'
): int
{
 
    // format data
    $startdate = str_replace('-','',$startdate);
    $enddate = str_replace('-','',$enddate);
    $starttime = str_replace(':','',$starttime).'00';
    $endtime = str_replace(':','',$endtime).'00';
 
 
    // start iCal function
    $eol = "\r\n";
    $sICalContent = 
        'BEGIN:VCALENDAR'.$eol.
        'CHARSET:'.strtoupper(DEFAULT_CHARSET).$eol.
        'VERSION:2.0'.$eol.
        'TZNAME:UTC'.$eol.
        'TZID:'.DEFAULT_TIMEZONE_STRING.$eol.
        'X-LIC-LOCATION:'.DEFAULT_TIMEZONE_STRING.$eol.
        'PRODID:LEPTON-CMS,https://lepton-cms.org, '.LANGUAGE.$eol.
        'CALSCALE:GREGORIAN'.$eol.
        'BEGIN:VEVENT'.$eol.
        'CLASS:PUBLIC'.$eol.
        'UID:'.LEPTON_URL.'_'.time().$eol.      
        'DTSTART:'.$startdate.'T'.$starttime.$eol.
        'DTEND:'.$enddate.'T'.$endtime.$eol.
        'LOCATION:'.$location.$eol.
        'DTSTAMP:'.date('Ymd',time()).'T'.date('his',time()).$eol.
        'SUMMARY:'.$title.$eol.
        'URL;VALUE=URI:'.LEPTON_URL.$eol.
        'DESCRIPTION:'.$description.$eol.
        'BEGIN:VALARM'.$eol.
        'ACTION:DISPLAY'.$eol.
        'TRIGGER:-PT'.$reminder.'M'.$eol.
        'DESCRIPTION:'.$reminder_text.$eol.
        'END:VALARM'.$eol.
        'END:VEVENT'.$eol.
        'END:VCALENDAR';
    $result = file_put_contents($filename,$sICalContent);   
 
    if($result === false)
    {
        echo(LEPTON_tools::display('Something went wrong, ics file not written!','pre','ui red message'));
    }
    return $result;
}