zAdd parameters

```
https://github.com/ukko/phpredis-phpdoc/blob/0d81e3ef83a39227e894bf7b67505c349c4ab21d/src/Redis.php#L2980

public function zAdd($key, $options, $score1, $value1, $score2 = null, $value2 = null, $scoreN = null, $valueN = null)
```

```
https://github.com/phpredis/phpredis/blob/48d18fcedab884820250436e7734bd6d154c7d4f/redis.c#L2132

Redis::zAdd(string key, int score, string value)
```