pocketmine\permission\Permission::recalculatePermissibles PHP Method

    public function recalculatePermissibles()
    {
        $perms = $this->getPermissibles();
        Server::getInstance()->getPluginManager()->recalculatePermissionDefaults($this);
        foreach ($perms as $p) {
            $p->recalculatePermissions();
        }
    }

 /**
  * @param string|Permission $name
  * @param                   $value
  *
  * @return Permission|void Permission if $name is a string, void if it's a Permission
  */
 public function addParent($name, $value)
 {
     if ($name instanceof Permission) {
         $name->getChildren()[$this->getName()] = $value;
         $name->recalculatePermissibles();
         return;
     } else {
         $perm = Server::getInstance()->getPluginManager()->getPermission($name);
         if ($perm === null) {
             $perm = new Permission($name);
             Server::getInstance()->getPluginManager()->addPermission($perm);
         }
         $this->addParent($perm, $value);
         return $perm;
     }
 }