<?xml version="1.0" encoding="UTF-8"?>

<container xmlns="http://symfony.com/schema/dic/services"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

xsi:schemaLocation="http://symfony.com/schema/dic/services

http://symfony.com/schema/dic/services/services-1.0.xsd"

>

<services>

<service id="my_mailer" class="Acme\HelloBundle\Mailer">

Using the Expression Language

..versionadded::2.4

The Expression Language functionality was introduced in Symfony 2.4.

The service container also supports an "expression" that allows you to inject

very specific values into a service.

For example, suppose you have a third service (not shown here), called ``mailer_configuration``,

which has a ``getMailerMethod`` method on it, which will return a string

which has a ``getMailerMethod()`` method on it, which will return a string

like ``sendmail`` based on some configuration. Remember that the first argument

to the ``my_mailer`` service is the simple string ``sendmail``:

But instead of hardcoding this, how could we get this value from the ``getMailerMethod``

But instead of hardcoding this, how could we get this value from the ``getMailerMethod()``

of the new ``mailer_configuration`` service? One way is to use an expression:

..configuration-block::

To learn more about the expression language syntax, see:doc:`/components/expression_language/syntax`.

..code-block::xml

..code-block::php

Expressions can be used in ``parameters``, ``arguments``, ``properties``,