Construct InventoryTransactionPacket

PHP:

      $pk = new InventoryTransactionPacket();
                $pk->transactionType = InventoryTransactionPacket::TYPE_USE_ITEM_ON_ENTITY;
                $pk->trData->actionType = InventoryTransactionPacket::USE_ITEM_ON_ENTITY_ACTION_ATTACK;
                $pk->trData->entityRuntimeId = $id;
                $pk->trData->hotbarSlot = 0;
                $pk->trData->itemInHand = Item::get(Item::DIAMOND_SWORD);
                $pk->trData->playerPos = $this->lastpos;
                $pk->trData->clickPos = $position;
                $pk->isCraftingPart = false;
                $pk->encode();

My code isnt working, but idk why. Can anybody please help me?

 

What do you expect this to do?

 

Attack an player nearby an player. I want to do this with an packet. The packet is sent by an proxy. I want to create a completly new Minigame.

 

What in it is not working? And are there any errors?

 

Warning: Creating default object from empty value in C:\Users\SkyZoneMC\Desktop\Proxyyyyyyyy\plugins\SkyGame\src\Sky\Main.php on line 102

 

PHP:

$pk->trData = new \stdClass();