Non-latin letters break vCard

[mvasin]

Here's the code I use for test:

<?php

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/vendor/jeroendesloovere/vcard/src/VCard.php';

use JeroenDesloovere\VCard\VCard;

// define vcard
$vcard = new VCard();

// define variables
$firstname = 'John';
$lastname = 'Doe';
$additional = '';
$prefix = '';
$suffix = '';

// add personal data
$vcard->addName($lastname, $firstname, $additional, $prefix, $suffix);

// add work data
$vcard->addCompany('Siesqo');
$vcard->addJobtitle('Web Developer');
$vcard->addEmail('[email protected]');
$vcard->addPhoneNumber(1234121212, 'PREF;WORK');
$vcard->addPhoneNumber(123456789, 'WORK');
$vcard->addAddress(null, null, 'street', 'worktown', null, 'workpostcode', 'Belgium');
$vcard->addURL('http://www.jeroendesloovere.be');

return $vcard->download();

Import into contact book on macOS Sierra 10.12.3 goes fine.

But when I use Cyrillic letters...

$firstname = 'Иван';
$lastname = 'Петров';

I get this error when I try to import on macOS:

No cards added. No importable cards were found.

This is the generated broken card:

BEGIN:VCARD
VERSION:3.0
REV:2017-03-07T21:37:15Z
N;CHARSET=utf-8:Петров;Иван;;;
FN;CHARSET=utf-8:Иван Петров
ORG;CHARSET=utf-8:Siesqo
TITLE;CHARSET=utf-8:Web Developer
EMAIL;INTERNET:[email protected]
TEL;PREF;WORK:1234121212
TEL;WORK:123456789
ADR;WORK;POSTAL;CHARSET=utf-8:;;street;worktown;;workpostcode;Belgium
URL:http://www.jeroendesloo

To compare, when I make up a similar card in macOS Contacts app and export it, here's the working (importable) vCard I get:

BEGIN:VCARD
VERSION:3.0
PRODID:-//Apple Inc.//Mac OS X 10.12.3//EN
N:Петров;Иван;;;
FN:Иван Петров
ORG:Siesqo;
TITLE:Web Developer
EMAIL;type=INTERNET;type=HOME;type=pref:[email protected]
TEL;type=WORK;type=VOICE;type=pref:1234121212
TEL;type=WORK;type=VOICE:123456789
ADR;type=HOME;type=pref:;;street;worktown;;workpostcode;Belgium
item1.URL;type=pref:http://www.jeroendesloovere.be
item1.X-ABLabel:_$!<HomePage>!$_
X-ABUID:A350AF28-459F-420B-A068-BCC92001D906
END:VCARD

[mvasin]

I notice there is no END:VCARD in the end of the broken vCard, and url field is chopped.

When I simplify code further, leaving just first and last names, here's what's inside the .vcf file the browser downloads:

BEGIN:VCARD
VERSION:3.0
REV:2017-03-07T21:50:05Z
N;CHARSET=utf-8:Петров;Иван;;;
FN;CHARSET=utf-8:Иван Пе�

This "�" obviously does not belong here, and the rest of the vCard is trimmed.

For a name with latin letters, vCard download looks just fine:

BEGIN:VCARD
VERSION:3.0
REV:2017-03-07T21:53:45Z
N;CHARSET=utf-8:Petrov;Ivan;;;
FN;CHARSET=utf-8:Ivan Petrov
END:VCARD

[mvasin]

When I use return $vcard->save(); instead of return $vcard->download();, it does save the proper (not-trimmed) vCard on the harddrive. echo $vcard->getOutput(); works fine as well.

I tried nginx and built-in php -S server, the download() method seems to be broken for both.