urlValidator.php

<?php

$loader = require_once __DIR__.'/app/bootstrap.php.cache';
require_once __DIR__.'/app/AppKernel.php';

$kernel = new AppKernel('dev', true);
$kernel->loadClassCache();
$kernel->boot();
$container = $kernel->getContainer();
$validator = $container->get('validator');

$url = 'http://www.rilin.state.ri.us/representatives/Messier';

$result = $validator->validate($url, new \Symfony\Component\Validator\Constraints\Url());

var_dump($result); // No violations