UserToBlog::isDeleted PHP Method

    public function isDeleted()
    {
        return $this->status == self::STATUS_DELETED;
    }

 /**
  * @param $userId
  * @return bool
  */
 public function join($userId)
 {
     if ($this->isPrivate()) {
         return false;
     }
     if ($this->userIn((int) $userId)) {
         return true;
     }
     //check user status in blog
     $member = $this->getUserMembership($userId);
     if (null === $member) {
         $member = new UserToBlog();
         $member->blog_id = $this->id;
         $member->user_id = (int) $userId;
         $member->status = (int) $this->member_status;
     } else {
         if ($member->isDeleted()) {
             $member->activate();
         } else {
             return false;
         }
     }
     if ($member->save()) {
         Yii::app()->eventManager->fire(BlogEvents::BLOG_JOIN, new BlogJoinLeaveEvent($this, $userId));
         Yii::app()->getCache()->delete("Blog::Blog::members::{$userId}");
         return true;
     }
     return false;
 }