我可以使用Symfony的验证约束NotEqualTo不区分大小写吗

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

class NotEqualToIgnoreCaseValidator extends ConstraintValidator
{
    public function validate($value, Constraint $constraint)
    {
        if (strcasecmp($value, $constraint->value) === 0) {
            $this->context->buildViolation($constraint->message)
                ->setParameter('{{ value }}', $value)
                ->addViolation();
        }
    }
}

/**
 * @Annotation
 */
class NotEqualToIgnoreCase extends Constraint
{
    public $message = 'This value should not be equal to "{{ value }}".';
}

use App\Validator\NotEqualToIgnoreCase;

class MyEntity
{
    /**
     * @NotEqualToIgnoreCase(value="admin", message="The value should not be equal to 'admin'.")
     */
    private $username;
}