title: How to call to another services in Symfony?
body: <p>I got a problem like this
  I got a service to inject doctrine and use the entity manager to insert a user record into database: UsersService.php</p>
  
  <p>And i got a service to send email: MyEmailService.php</p>
  
  <p>All both services injected in the services.yml(follow this docs <a href="http://symfony.com/doc/current/book/service_container.html" rel="nofollow">http://symfony.com/doc/current/book/service_container.html</a>). All of them work fine.</p>
  
  <p>So now my problem is: I have a class call UserFacade.php(<strong>not extends any controller</strong>). It has a method "addUser". In this function it will call to UserService.php to insert a record into database, then call the MyEmailService.php to send an email to user's email.
  How can i do that in Symphony? I'm the newbie with bundle in Symphony.</p>
  
  <p>Please help
  Thanks</p>