I'm using a php lib to retrieve the opengraph tags from a website https://github.com/scottmac/opengraph/blob/master/OpenGraph.php
<?php
header("Content-Type: text/html; charset=utf-8");
$url = 'http://www.youtube.com/watch?v=ogHIUNfu2vY';
require_once $_SERVER['DOCUMENT_ROOT'] . '/php/libs/opengraph/OpenGraph.php';
$graphObj = OpenGraph::fetch($url);
echo '<pre>';
print_r($graphObj);
echo '</pre>';
This title is incorrectly retrieved as
[title] => Hüsker Dü - I'll Never Forget You
It should be
[title] => Hüsker Dü - I'll Never Forget You
How can I retrieve the open graph tags in utf-8?