我怎樣才能在symfony的

Question

使用SWIFT郵件在我的PHP代碼，我使用的這個，但我得到的錯誤

foo_bundle.listener.comment: 
     class: xxx\Listener\CupleListener 
     arguments: [@mailer] 

---

class CupleListener 
{ 
    protected $mailer; 

    public function __construct(Swift_Mailer $mailer) 
    { 
     $this->mailer = $mailer; 
    } 

    public function onCenterEvent(CupleEvent $event) 
    { 
     $center = $event->getcenter(); 

      $message = \Swift_Message::newInstance() 
      ->setSubject('New comment posted on ' . $post->getTitle()) 
      ->setFrom('send@example.com') 
      ->setTo('xxxxxxxxxx') 
      ->setBody("Hey, somebody left a new comment on a post you're subscribed to! It says: " . $comment->getBody()); 
      $this->mailer->send($message); 

    } 
} 

這是給錯誤

此外，我不知道名稱空間頂部包括哪些類別

Answer 1

試一下：

public function __construct(\Swift_Mailer $mailer) 
{ 
    $this->mailer = $mailer; 
}