pocketmine\entity\Minecart::onUpdate PHP Method

    public function onUpdate($currentTick)
    {
        if ($this->closed !== false) {
            return false;
        }
        $tickDiff = $currentTick - $this->lastUpdate;
        if ($tickDiff <= 1) {
            return false;
        }
        $this->lastUpdate = $currentTick;
        $this->timings->startTiming();
        $hasUpdate = false;
        //parent::onUpdate($currentTick);
        if ($this->isAlive()) {
            $p = $this->getLinkedEntity();
            if ($p instanceof Player) {
                if ($this->state === Minecart::STATE_INITIAL) {
                    $this->checkIfOnRail();
                } elseif ($this->state === Minecart::STATE_ON_RAIL) {
                    $hasUpdate = $this->forwardOnRail($p);
                    $this->updateMovement();
                }
            }
        }
        $this->timings->stopTiming();
        return $hasUpdate or !$this->onGround or abs($this->motionX) > 1.0E-5 or abs($this->motionY) > 1.0E-5 or abs($this->motionZ) > 1.0E-5;
    }