Pop\Web\Session::getInstance PHP Method

    public static function getInstance()
    {
        if (null === self::$instance) {
            self::$instance = new Session();
        }
        return self::$instance;
    }

 /**
  * Set the field values
  *
  * @param  array $values
  * @return Unsubscribe
  */
 public function setFieldValues(array $values = null)
 {
     parent::setFieldValues($values);
     if ($_POST && null !== $this->email) {
         $member = Table\Users::findBy(['email' => $this->email]);
         if (!isset($member->id)) {
             $this->getElement('email')->addValidator(new Validator\NotEqual($this->email, 'That email does not exist.'));
         } else {
             if (null !== $member->role_id) {
                 $sess = \Pop\Web\Session::getInstance();
                 $requireLogin = true;
                 $role = Table\Roles::findById($member->role_id);
                 if (isset($role->id) && null !== $role->permissions) {
                     $permissions = unserialize($role->permissions);
                     if (isset($permissions['deny'])) {
                         foreach ($permissions['deny'] as $deny) {
                             if ($deny['resource'] == 'member-login') {
                                 $requireLogin = false;
                             }
                         }
                     }
                 }
                 if ($requireLogin) {
                     if (!isset($sess->member) || isset($sess->member) && $sess->member->id != $member->id) {
                         $memberAdmin = new \Phire\Members\Model\MembersAdmin();
                         $memberAdmin->getByRoleId($member->role_id);
                         $memberUri = isset($memberAdmin->uri) ? $memberAdmin->uri : APP_URI;
                         $this->getElement('email')->addValidator(new Validator\NotEqual($this->email, 'You must <a href="' . BASE_PATH . $memberUri . '/login">log in</a> to unsubscribe.'));
                     }
                 }
             }
         }
     }
     return $this;
 }