问苗条Framewrok异常处理

EN

$smartView= new \Slim\Views\Smarty();
$app = new \Slim\Slim(array(
'debug' => false,
'view' => $smartView,
'templates.path' => '../templates/',
));
$app->error(function ( Exception $e ) use ($app) {
echo "my exception print here : " . $e;
});

$app->get('/game', function () use ($app) {
   try{
        $facebook = new Facebook(array(
            'appId'  => appid,
            'secret' =>appsecret,
            'cookie' => true,
            'allowSignedRequest' => true
        ));

            $oStuff = new models\User ();
            $oStuff->fbLogin($facebook); // To get User details and game select
   }
    catch (\Exception $e) {
        //echo 'Caught exception: ',  $e->getMessage(), "\n";
       echo $e;
       echo "catch exception";
    }
});

 public function fbLogin($facebook)
    { 
      $app = \Slim\Slim::getInstance(); 
      $user = $facebook->getUser() // here is syntax error so i need to get it in my  exception

 }