Jamm\Memory\Shm\SingleMemory::get_key_ttl PHP Method

    protected function get_key_ttl($key, &$mem)
    {
        $ttl_left = self::max_ttl;
        if (!empty($mem[self::map_key_ttl][$key])) {
            $ttl_left = $mem[self::map_key_ttl][$key] - time();
        }
        return $ttl_left;
    }