pocketmine\level\GameRules::getRule PHP Method

    public function getRule($name)
    {
        $rule = $this->getRulesArray()[$name];
        if ($rule == "true") {
            $rule = true;
        } elseif ($rule == "false") {
            $rule = false;
        }
        return $rule;
    }

 public function getGameRule($name)
 {
     return $this->gamerules->hasRule($name) ? $this->gamerules->getRule($name) : null;
 }