use pocketmine\network\mcpe\protocol\serializer\PacketSerializer; class AddBehaviorTreePacket extends DataPacket implements ClientboundPacket{ public const NETWORK_ID = ProtocolInfo::ADD_BEHAVIOR_TREE_PACKET; /** @var string */ public $behaviorTreeJson; protected function decodePayload(PacketSerializer $in) : void{ $this->behaviorTreeJson = $in->getString(); } protected function encodePayload(PacketSerializer $out) : void{ $out->putString($this->behaviorTreeJson); } public function handle(PacketHandlerInterface $handler) : bool{ return $handler->handleAddBehaviorTree($this); } }