php - Twig with Symfony 2 displaying json encoded variables different between prod and dev

Question

We're building a Symfony 2 application that sends some data from controller to view:

Controller

$user = array(
    'configuration' => array(
        'levels' => array(
            'warning' => 0.05,
            'danger'  => 0.10,
        ),
    ),
);

return $this->render(
    'MyWebsiteBundle:Core:searchResults.html.twig',
    array(
        'userJSON'  => json_encode($user)
    )
);

View

<script language="javascript">
    user = $.parseJSON("{{ userJSON }}");
</script>

Result

On dev the result looks like this and works as expected:

user = $.parseJSON("\x7B\x22configuration\x22\x3A\x7B\x22levels\x22\x3A\x7B\x22warning\x22\x3A0.05,\x22danger\x22\x3A0.1\x7D\x7D\x7D");

On the other hand, on prod the result is encoded in a different manner, thus displaying errors in console:

user = $.parseJSON("{"configuration":{"levels":{"warning":0.05,"danger":0.1}}}");

Console Error: Uncaught SyntaxError: Unexpected token &

What generates this difference?

Answer 1

编辑：还要检查下面@Lulhum 的解决方案。如果它更好，请投票，所以我会选择它作为正确答案。

“问题”是 Twig 自动转义变量。我使用 Twig 的raw过滤器来跳过自动转义，如下所示：

<script language="javascript">
    user = $.parseJSON('{{ userJSON | raw }}');
</script>

现在它打印：

user = $.parseJSON('{"configuration":{"levels":{"warning":0.05,"danger":0.1}}}');

链接： Symfony 2 Docs - 输出转义

Answer 2

最好尽可能避免使用raw过滤器。您可以在此处使用escape过滤器 ( doc ) 实现相同的行为。

<script language="javascript">
    user = $.parseJSON('{{ userJSON | escape('js') }}');
</script>