pocketmine\block\Lever::onActivate PHP Method

    public function onActivate(Item $item, Player $player = null)
    {
        $this->meta ^= 0x8;
        $this->getLevel()->setBlock($this, $this, true, false);
        if ($this->isActivated()) {
            $this->activate();
        } else {
            $this->deactivate();
        }
        return true;
    }