MatthiasMullie\Scrapbook\Adapters\Redis::getMulti PHP Method

    public function getMulti(array $keys, array &$tokens = null)
    {
        $this->client->multi();
        $this->client->mget($keys);
        foreach ($keys as $key) {
            $this->client->exists($key);
        }
        /** @var array $return */
        $return = $this->client->exec();
        if ($return === false) {
            return array();
        }
        $values = array_shift($return);
        $exists = $return;
        if ($values === false) {
            $values = array_fill_keys($keys, false);
        }
        $values = array_combine($keys, $values);
        $exists = array_combine($keys, $exists);
        $tokens = array();
        foreach ($values as $key => $value) {
            // filter out non-existing values
            if ($exists[$key] === false) {
                unset($values[$key]);
                continue;
            }
            // serializing to make sure we don't pass objects (by-reference) ;)
            $tokens[$key] = serialize($value);
        }
        return $values;
    }