pocketmine\network\protocol\UpdateBlockPacket::encode PHP Method

    public function encode()
    {
        $this->reset();
        $this->putInt($this->x);
        $this->putInt($this->z);
        $this->putByte($this->y);
        $this->putByte($this->blockId);
        $this->putByte($this->flags << 4 | $this->blockData);
    }