Example usage voters in symfony.

Use in controller

$this->denyAccessUnlessGranted('edit_comment', $comment);

Voter

<?php
namespace MainBundle\Security;
use MainBundle\Entity\Comment;
use MainBundle\Entity\User;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Authorization\Voter\Voter;
/**
 * Class CommentVoter
 *
 * @package MainBundle\Security
 */
class CommentVoter extends Voter
{
    const VIEW = 'view_comment';
    const EDIT = 'edit_comment';
    const DELETE = 'delete_comment';
    protected function supports($attribute, $subject)
    {
        if (!in_array($attribute, array(self::VIEW, self::EDIT, self::DELETE))) {
            return false;
        }
        if (!$subject instanceof Comment) {
            return false;
        }
        return true;
    }
    protected function voteOnAttribute($attribute, $subject, TokenInterface $token)
    {
        $user = $token->getUser();
        if (!$user instanceof User) {
            return false;
        }
        /** @var Comment $comment */
        $comment = $subject;
        switch ($attribute) {
            case self::VIEW:
                return $this->canView($comment, $user);
            case self::EDIT:
                return $this->canEdit($comment, $user);
            case self::DELETE:
                return $this->canDelete($comment, $user);
        }
        throw new \LogicException('This code should not be reached!');
    }
    private function canView(Comment $comment, User $user)
    {
        return $this->currentUserRights($comment, $user);
    }
    private function canEdit(Comment $comment, User $user)
    {
        return $this->currentUserRights($comment, $user);
    }
    private function canDelete(Comment $comment, User $user)
    {
        return $this->currentUserRights($comment, $user);
    }
    private function currentUserRights(Comment $comment, User $user)
    {
        foreach ($user->getRoles() as $role) {
            if ('ROLE_SUPER_ADMIN' === $role || 'ROLE_MODERATOR' === $role) {
                return true;
            }
        }
        $getCommentUser = $comment->getUser()->getId();
        $getLoginUser = $user->getId();
        if ($getCommentUser === $getLoginUser) {
            return true;
        }
        return false;
    }
}