@@ -67,7 +67,7 @@ Then you can set the choice of transport in the container::
6767 $container = new ContainerBuilder();
6868 $container
6969 ->register('mailer', 'Mailer')
70-
70+ ->addArgument('sendmail');
7171
7272This class is now much more flexible as you have separated the choice of
7373transport out of the implementation and into the container.
@@ -83,7 +83,7 @@ it a parameter in the container and then referring to this parameter for the
8383 $container->setParameter('mailer.transport', 'sendmail');
8484 $container
8585 ->register('mailer', 'Mailer')
86-
86+ ->addArgument('%mailer.transport%');
8787
8888Now that the ``mailer `` service is in the container you can inject it as
8989a dependency of other classes. If you have a ``NewsletterManager `` class
@@ -111,11 +111,11 @@ Then you can register this as a service as well and pass the ``mailer`` service
111111 $container->setParameter('mailer.transport', 'sendmail');
112112 $container
113113 ->register('mailer', 'Mailer')
114-
114+ ->addArgument('%mailer.transport%');
115115
116116 $container
117117 ->register('newsletter_manager', 'NewsletterManager')
118-
118+ ->addArgument(new Reference('mailer'));
119119
120120If the ``NewsletterManager `` did not require the ``Mailer `` and injecting
121121it was only optional then you could use setter injection instead::
@@ -143,11 +143,11 @@ If you do want to though then the container can call the setter method::
143143 $container->setParameter('mailer.transport', 'sendmail');
144144 $container
145145 ->register('mailer', 'Mailer')
146-
146+ ->addArgument('%mailer.transport%');
147147
148148 $container
149149 ->register('newsletter_manager', 'NewsletterManager')
150-
150+ ->addMethodCall('setMailer', new Reference('mailer'));
151151
152152You could then get your ``newsletter_manager `` service from the container
153153like this::
@@ -261,4 +261,4 @@ The ``newsletter_manager`` and ``mailer`` services can be set up using config fi
261261 ->register('newsletter_manager', 'NewsletterManager')
262262 ->addMethodCall('setMailer', new Reference('mailer'));
263263
264- Packagist :https://packagist.org/packages/symfony/dependency-injection
264+ Packagist :https://packagist.org/packages/symfony/dependency-injection