php__silex__book/src/demo/Views/JsonView.php

<?php

namespace demo\Views;

use Silex\Application;
use Symfony\Component\HttpFoundation\Request;

/**
 * Class JsonView is a JSON view handler.
 *
 * @package demo\Views
 */
class JsonView {

  public function handle(array $controllerResult, Request $request) {
    // Does limited escaping using JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT.
    // Try /hello-json/<script>alert('Yo');<script> : Chrome with JSON Decode
    // extension throws JS error, which proves interpretation is triggered. This
    // is actually due to the extension.
    return $GLOBALS['app']->json($controllerResult);
  }
}