如何在带有sbmit按钮的php页面中传递smarty数组

require_once('smarty/libs/Smarty.class.php');

$smarty = new Smarty();
$smarty->setTemplateDir('templates');
$smarty->setCompileDir('templates_c');

$data = array(
    'name' => 'John Doe',
    'age' => 25,
    'email' => 'johndoe@example.com'
);

$smarty->assign('data', $data);

<form action="submit.php" method="post">
    <input type="hidden" name="data" value="{$data|json_encode}">
    <input type="submit" value="Submit">
</form>

$data = json_decode($_POST['data'], true);