private function genArrayHash(array $var)
    {
        static $dump;

        if (!isset($dump)) {
            $dump = [];
        }

        if (in_array($var, $dump, true)) {
            return 'array recursion';
        }

        $dump[] = $var;

        $hash = [];
        foreach ($var as $k => $v) {
            if (is_object($v)) {
                $hash[$k] = spl_object_hash($v);
            } elseif (is_array($v)) {
                $hash[$k] = $this->genArrayHash($v);
            } elseif (is_resource($v)) {
                $hash[$k] = intval($v) . get_resource_type($v);
            } else {
                $hash[$k] = $v;
            }
        }

        $hash = json_encode($hash);

        array_pop($dump);

        return $hash;
    }