How to Inject Variables into all Templates (i.e. Global Variables)

Sometimes you want a variable to be accessible to all the templates you use. This is possible inside your app/config/config.yml file:

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

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

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

Now, the variable ga_tracking is available in all Twig templates:

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        <p>The google tracking code is: {{ ga_tracking }}</p>
    

It's that easy! 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.

More Complex Global Variables

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.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.