Implement `wp_cache_get_multi()`
Redis has an http://redis.io/commands/mget command that will let us do this.
See also https://github.com/nicolasff/phpredis#mget-getmultiple.
Redis has an http://redis.io/commands/mget command that will let us do this.
See also https://github.com/nicolasff/phpredis#mget-getmultiple.