pocketmine\block\PoweredRepeater::onActivate PHP Method

    public function onActivate(Item $item, Player $player = null)
    {
        $meta = $this->meta + 4;
        if ($meta > 15) {
            $this->meta = $this->meta % 4;
        } else {
            $this->meta = $meta;
        }
        $this->getLevel()->setBlock($this, $this, true, false);
        return true;
    }