Using php code in .twig file slim framework

Question

I am using Slim Framework for the first time and also using twig for templatizing. I have a land.twig file the contents of that file are

 <form action="index.html" method="get">
          <div class="form-group">
            <input type="text" class="form-control" placeholder="Full Name">
          </div>
</form>

I also have a string file to support multi-language and the way I call the string for translation is lang("some_string"); . The land.twig file is rendered by a controller. My question is how can I add lang("some_string") within placeholder attribute for html elements in that twig file ?

Answer 1

You could use Twig_SimpleFilter.

require_once '/path/to/lib/Twig/Autoloader.php';
Twig_Autoloader::register();

$loader = new Twig_Loader_Filesystem('/path/to/templates');
// an anonymous function
$filter = new Twig_SimpleFilter('lang', function ($string) {
    //do stuff
    return $string;
});

$twig = new Twig_Environment($loader);
$twig->addFilter($filter);

Then in your template you can use

 <input type="text" class="form-control" placeholder="{{ 'Full Name'|lang }}">

Since you are using slim and its twig integration you have to add the filter within the twig component.

// Register component on container
$container['view'] = function ($container) {
   $view = new \Slim\Views\Twig('path/to/templates', [
       'cache' => 'path/to/cache'
    ]);
    $view->addExtension(new \Slim\Views\TwigExtension(
        $container['router'],
        $container['request']->getUri()
    ));

    $filter = new Twig_SimpleFilter('lang', function ($string) {
        //do stuff
        return $string;
    });

    $view->getEnvironment()->addFilter($filter);

    return $view;
};

Other than that twig has a i18n extension .