使用php更新单个ics文件（icalendar流）中的多个事件

Question

After adding multiple events in a single ics file, I have used the given code for updating multiple events in a single ics file. But its not working. The events are not updated. Any body please help me. My code is given:

$ical = "BEGIN:VCALENDAR";    
$ical .= "\nVERSION:2.0";    
$ical .= "\nPRODID:-//hacksw/handcal//NONSGML v1.0//EN";    
$ical .= "\nMETHOD:REQUEST";    
$ical .= "\nCALSCALE:GREGORIAN";    
$ical .= "\nX-WR-RELCALID:asjh675adashdh";    
$ical .= "\nX-WR-CALNAME:My Nov Calendar";   

foreach($arr as $newArr){
    $ical .= "\nBEGIN:VEVENT";    
    $ical .= "\nUID:" . md5($newArr['stDate']) . "example.com";    
    $ical .= "\nSEQUENCE:1";    
    $ical .= "\nDTSTAMP:" . gmdate('Ymd');    
    $ical .= "\nORGANIZER:catalog@example.com";    
    $ical .= "\nDTSTART:".$newArr['stDate'];    
    $ical .= "\nDTEND:".$newArr['stDate'];    
    $ical .= "\nSUMMARY:".$newArr['sub'];    
    $ical .= "\nDESCRIPTION:".$newArr['desc'];    
    $ical .= "\nCLASS:PUBLIC";    
    $ical .= "\nSTATUS:CONFIRMED";    
    $ical .= "\nTRANSP:TRANSPARENT";    
    $ical .= "\nEND:VEVENT";    
}

$ical .= "\nEND:VCALENDAR";    
header('Content-type: text/calendar; charset=utf-8');    
header('Content-Disposition: inline; filename=my-calendar.ics');    
echo $ical;    
exit;

I have also change the SEQUENCE number but its not working.

Answer 1

What property does change in each event ?

Your UID property is based on the DTSTART of each event. So if you change the start of the event, the UID changes. UIDs must not change when updating an event. It is the one thing that should remain constant for the whole lifecycle of the event.

Dont know what gmdate('Ymd') does exactly but DTSTAMP are supposed to be YYYYMMDDTHHMMSSZ format.

Then you are missing a METHOD=REQUEST parameter in the content-type header but I dont think that is causing the failure to update.