从$ app->获取Slim Framework获取数组

I have some problem with my app Slim Framework I would get the title of the recovered sample here

$app->get('/', function() use ($app){
$app->render('pages/homepage.php', array(
    'title' => 'Homepage',
));});

For example diferent pages also and it does not work

homepage.php return MySiteName | Home in html wiki.php return MySiteName | Wiki in html