如何重置所有进程的静态属性？

class SystemConfigService
{
    public static $configArr = [];
   public static function getKey($key){
        var_dump(self::$configArr);
        if(isset(self::$configArr[$key])){
            return self::$configArr[$key];
        }
        $redis = Redis::retRedis();
        $is = $redis->get(self::$key);
         self::$configArr[$key] = $is;
    }
   public static function refreshConfig()
    {
        self::$configArr = [];
        var_dump('已重置');
        return true;
    }
}