Using Service Container Parameters

You can also take advantage of the built-in Service Container system, which lets you isolate or reuse the value:

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# app/config/parameters.yml
parameters:
    ga_tracking: UA-xxxxx-x

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# app/config/config.yml
twig:
    globals:
        ga_tracking: "%ga_tracking%"

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<!-- app/config/config.xml -->
<twig:config ...>
    <twig:global key="ga_tracking">%ga_tracking%</twig:global>
</twig:config>

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// app/config/config.php
$container->loadFromExtension('twig', array(
     'globals' => array(
         'ga_tracking' => '%ga_tracking%',
     ),
));

The same variable is available exactly as before.

Referencing Services

Instead of using static values, you can also set the value to a service. Whenever the global variable is accessed in the template, the service will be requested from the service container and you get access to that object.

To define a service as a global Twig variable, prefix the string with @. This should feel familiar, as it's the same syntax you use in service configuration.

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# app/config/config.yml
twig:
    # ...
    globals:
        user_management: "@acme_user.user_management"

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<!-- app/config/config.xml -->
<twig:config ...>
    <!-- ... -->
    <twig:global key="user_management">@acme_user.user_management</twig:global>
</twig:config>

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// app/config/config.php
$container->loadFromExtension('twig', array(
     // ...
     'globals' => array(
         'user_management' => '@acme_user.user_management',
     ),
));

Using a Twig Extension

If the global variable you want to set is more complicated - say an object - then you won't be able to use the above method. Instead, you'll need to create a Twig Extension and return the global variable as one of the entries in the getGlobals method.