pocketmine\block\ExtendedRailBlock::setDirection PHP Метод

    public function setDirection($face, $isOnSlope = false)
    {
        $extrabitset = ($this->meta & 0x8) === 0x8;
        if ($face !== Vector3::SIDE_WEST && $face !== Vector3::SIDE_EAST && $face !== Vector3::SIDE_NORTH && $face !== Vector3::SIDE_SOUTH) {
            throw new IllegalArgumentException("This rail variant can't be on a curve!");
        }
        $this->meta = $extrabitset ? $this->meta | 0x8 : $this->meta & ~0x8;
        $this->getLevel()->setBlock($this, Block::get($this->id, $this->meta));
    }