Check if translation exists with Symfony translation component

run.php

<?php

require 'vendor/autoload.php';

use Symfony\Component\Translation\Translator;
use Symfony\Component\Translation\MessageSelector;
use Symfony\Component\Translation\Loader\ArrayLoader;


/**
 * Class run
 * @author yourname
 */
class Core
{
  public function run()
  {
    $locale = 'fr_FR';
    $locale = 'lt_LT';
    $translator = new Translator($locale, new MessageSelector());
    $translator->addLoader('array', new ArrayLoader());
    $translator->addResource('array', array(
      'Hello World!' => 'Bonjour',
    ), 'fr_FR');
    $translator->addResource('array', array(
      'Hello World!' => 'Labas!',
      'Crab' => 'Krabas',

    ), 'lt_LT');

    echo "RUNNING....\n";

    echo $translator->trans('Crab') . PHP_EOL;
    echo $translator->trans('Hello') . PHP_EOL;
    
    $c = $translator->getCatalogue($locale);
    var_dump($c->has('Crab')); die();
  }
}


$c = new Core();
$c->run($argv, $argc);