Pimcore\Model\Document::__sleep PHP Method

    public function __sleep()
    {
        $finalVars = [];
        $parentVars = parent::__sleep();
        if (isset($this->_fulldump)) {
            // this is if we want to make a full dump of the object (eg. for a new version), including childs for recyclebin
            $blockedVars = ["dependencies", "userPermissions", "hasChilds", "versions", "scheduledTasks", "parent"];
            $finalVars[] = "_fulldump";
            $this->removeInheritedProperties();
        } else {
            // this is if we want to cache the object
            $blockedVars = ["dependencies", "userPermissions", "childs", "hasChilds", "versions", "scheduledTasks", "properties", "parent"];
        }
        foreach ($parentVars as $key) {
            if (!in_array($key, $blockedVars)) {
                $finalVars[] = $key;
            }
        }
        return $finalVars;
    }

 /**
  *
  */
 public function __sleep()
 {
     $finalVars = array();
     $parentVars = parent::__sleep();
     $blockedVars = array("inheritedElements");
     foreach ($parentVars as $key) {
         if (!in_array($key, $blockedVars)) {
             $finalVars[] = $key;
         }
     }
     return $finalVars;
 }