SmartyBundle - Assign variables to every template

GlobalVariablesContainer.php

<?php

namespace Vendorx;

class GlobalVariablesContainer
{
    protected $vars;

    public function __construct($three = 3)
    {
        $vars = array(
            'one'   => 1,
            'two'   => 2,
            'three' => $three
        );
    }

    public function getVars()
    {
        return $this->vars;
    }
}

GlobalVariablesExtension.php

<?php

namespace Vendorx;

use NoiseLabs\Bundle\SmartyBundle\Extension\AbstractExtension;

class GlobalVariablesExtension extends AbstractExtension
{
    public function __construct(GlobalVariablesContainer $gvc)
    {
        $this->gvc = $gvc;
    }

    public function getGlobals()
    {
        return array('_vars' => $this->gvc->getVars());
    }

    public function getName()
    {
        return 'vendorx_global_vars';
    }
}

}

services.xml

<?xml version="1.0" ?>

<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">
    <services>
        <service id="vendorx.global_variables_container">
        </service>

        <service id="vendorx.smartybundle_extension.globals">
            <argument type="service" id="vendorx.global_variables_container">
            <tag name="smarty.extension" />
        </service>
    </services>
</container>

test.smarty

<h1>One is {$_vars.one}</h1>