setAttribute('graphviz.graph.rankdir', 'LR');
$hello = $graph->createVertex('hello');
$world = $graph->createVertex('wörld');
$hello->createEdgeTo($world);
$graphviz = new Graphp\GraphViz\GraphViz();
$graphviz->setFormat('svg');
echo '
hello wörld
' . $graphviz->createImageHtml($graph) . '
';