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$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));

Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )
)

$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));
$b = json_encode($a);
$c = json_decode($b, true);

return $this->render('AcmeTestBundle:Home:data.html.twig', array('data' => $c));

{% extends '::base.html.twig' %}

{% block stylesheets %}

    <link href="{{ asset('bundles/acmetest/css/test.css') }}" type="text/css" rel="stylesheet" />

{% endblock %}

{% block body %}

    {{ data }}

{% endblock %}

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>{% block title %}Welcome!{% endblock %}</title>
        {% block stylesheets %}{% endblock %}
        <link rel="icon" type="image/x-icon" href="{{ asset('favicon.ico') }}" />
    </head>
    <body>
        {% block body %}{% endblock %}
        {% block javascripts %}{% endblock %}
    </body>
</html>

<pre>{% debug data %}</pre>

$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));

return $this->render('AcmeTestBundle:Home:data.html.twig', array('data' => var_export($a, true)));

<pre>{{ data }}</pre>