Symfony Custom Form Basic Spam Validators

ContainsHtml.php

<?php
namespace Ziadoz\Validator\Constraints;

use Symfony\Component\Validator\Constraint;

/**
 * @Annotation
 */
class ContainsHtml extends Constraint
{
    public $message = 'This value must not contain HTML markup.';
}

ContainsHtmlValidator.php

<?php
namespace Ziadoz\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;

class ContainsLinksValidator extends ConstraintValidator
{
    public function validate($value, Constraint $constraint)
	{
		$links = (int) (substr_count($value, 'http://') + substr_count($value, 'https://'));
		if ($links > $constraint->max) {
			$this->context->addViolation($constraint->message, array('%max%' => $constraint->max));
		}
	}
}

ContainsLinks.php

<?php
namespace Ziadoz\Validator\Constraints;

use Symfony\Component\Validator\Constraint;

/**
 * @Annotation
 */
class ContainsLinks extends Constraint
{
    public $message = 'This value must not contain more than %max% links.';
	public $max = 2;

    /**
     * {@inheritDoc}
     */
	public function getDefaultOption()
	{
		return 'max';
	}
}

silex-usage.php

<?php
use Ziadoz\Validator\Constraints as CustomAssert;

$form = $app['form.factory']->createBuilder('form', array());
$form->add('message', 'textarea', array(
    'constraints' => array(
        new CustomAssert\ContainsHtml(),
        new CustomAssert\ContainsLinks(array('max' => 4)),
    ),
));