Doctrine integration

Here is it with the getshared: (Hope is working like that) 

PHP Code:

class Services extends CoreServices
{

  //DOCTRINE SERVICE CLASS
    public static function doctrine($getShared = false)
    {
      if (! $getShared)
       {
        // INITIATE
        $doctrine = new \App\Libraries\Doctrine;
        // SHORTCUT ENTITY MANAGER
        $em = $doctrine->em;
        // RETURN ENTITY MANAGER
        return $em;
      }
      return static::getSharedInstance('doctrine');
    }
    
} 


But i didn't get what do you meant with the '$em' ?