Electrum PHP Commands

Hello everyone.. I want use, electrum daemon on my php pages without blockchain...

Electrum daemon and rpc port works fine... I use this electrum php lib; (My electrum version 2.6.4)
https://github.com/shaman/php-electrum-library

and my php page is this;

Code:

require_once'electrum.php';

$electrum = new Electrum('127.0.0.1', 7777);

$response = $electrum->getbalance();

echo "$response";
?>

But page is empty.. I see only white page. Please help me... Thanks.