PHPDaemon\Clients\XMPP\XMPPRoster::fetch PHP Method

    public function fetch($cb = null)
    {
        $this->xmpp->queryGet($this->ns, function ($xml) use($cb) {
            $status = "result";
            $xmlroster = $xml->sub('query');
            $contacts = [];
            foreach ($xmlroster->subs as $item) {
                $groups = [];
                if ($item->name === 'item') {
                    $jid = $item->attrs['jid'];
                    //REQUIRED
                    $name = isset($item->attrs['name']) ? $item->attrs['name'] : '';
                    //MAY
                    $subscription = $item->attrs['subscription'];
                    foreach ($item->subs as $subitem) {
                        if ($subitem->name === 'group') {
                            $groups[] = $subitem->data;
                        }
                    }
                    $contacts[] = [$jid, $subscription, $name, $groups];
                    //Store for action if no errors happen
                } else {
                    $status = 'error';
                }
            }
            if ($status === 'result') {
                //No errors, add contacts
                foreach ($contacts as $contact) {
                    $this->_addContact($contact[0], $contact[1], $contact[2], $contact[3]);
                }
            }
            if ($xml->attrs['type'] === 'set') {
                $this->xmpp->sendXML('<iq type="reply" id="' . $xml->attrs['id'] . '" to="' . $xml->attrs['from'] . '" />');
            }
            if ($cb) {
                $cb($status);
            }
        });
    }