Using validators on a form object - http://www.symfonycentral.com/symfony-does-validation.html

ArticleController.php

<?php 
use MyCompany\BlogBundle\Entity\Article;
use MyCompany\BlogBundle\Form\ArticleType;
use Symfony\Component\HttpFoundation\Request;

/* ... rest of the controller */

    public function updateAction(Request $request)
    {
        $article = new Article();
    
        /* Create the form, add the article object */
        $form = $this->createForm(new ArticleType(), $article);
    
        if ($request->getMethod() == 'POST') {
            /* This is where we handle the postback... */
            $form->bindRequest($request);
    
            if ($form->isValid()) {
                /* Data is valid, do something in here*/
            } else {
                /* Data is invalid, do do something in here */
            }
        }
    }

/* rest of the controller... */