Question

I am creating Twig extensions so I can create custom filters and functions. I need to access a globally configured parameter in the ‘parameters.ini’ file.

How would I go about that?

Answer 1

You can pass them via dependency injection. Either pass the parameters via the constructor or use setter methods. This example uses xml for service definitions:

public class MyExtension extends \Twig_Extension
{
    protected $param;

    public function __construct($param)
    {
        $this->param = $param;
    }
}

---

<!-- in services.xml -->
<service id="my_bundle.twig.extension.name" class="Acme\Bundle\DemoBundle\Twig\Extension\MyExtension">
    <argument>%my_parameter%</argument>
    <tag name="twig.extension" />
</service>

Notice how the parameter is confined in percentage symbols. You can read more about dependency injection from the official book.