pocketmine\block\FenceGate::onActivate PHP Method

    public function onActivate(Item $item, Player $player = null)
    {
        $faces = [0 => 3, 1 => 0, 2 => 1, 3 => 2];
        if ($player !== null) {
            $this->meta = $faces[$player instanceof Player ? $player->getDirection() : 0] & 0x3 | ~$this->meta & 0x4;
        } else {
            $this->meta ^= 0x4;
        }
        $this->getLevel()->setBlock($this, $this, true);
        $this->level->addSound(new DoorSound($this));
        return true;
    }