无法使用js或php生成要下载的文件

Question

I know there are a lot of tutorials, but for some reason I am not managing to focus the search to my specific issue.

I want to have a link to download <a href="#" download="cal.ics">click</a>

For some reason it fills the file with all the echo's from my page instead of a string that i can prepare.

What am I missing?

Edit:

I want the file to contain the return of this function:

function createICS(){
header("Content-Type: text/Calendar; charset=utf-8'");
header("Content-Disposition: inline; filename=calendar.ics");
$ical = "BEGIN:VCALENDAR
    VERSION:2.0
    PRODID:-//Geektike/eventsboard//IL
    BEGIN:VEVENT
    UID:123456789
    SUMMARY:asd
    DTSTART:20140520T210000Z
    DTEND:20140520T220000Z
    LAST-MODIFIED:20111115T103014Z
    LOCATION:here
    DESCRIPTION:cool
    END:VEVENT
    END:VCALENDAR";

return $ical;
exit;
}

Answer 1

This: <a href="#" download="cal.ics">click</a> will need to be this: <a href="#" download="cal.php">click</a>.

Then create the cal.php file and have this code inside it:

<?php
  print createICS();
?>

(That's as long as the cal.php file has access to the createICS() function, otherwise put that function in to the cal.php file as well).