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

2.1 version
Unmaintained

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:

  • YAML
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    # app/config/config.yml
    twig:
        # ...
        globals:
            ga_tracking: UA-xxxxx-x
    
  • XML
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    <!-- app/config/config.xml -->
    <twig:config ...>
        <!-- ... -->
        <twig:global key="ga_tracking">UA-xxxxx-x</twig:global>
    </twig:config>
    
  • PHP
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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 Parameters 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%"
    
  • XML
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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.