Improvement on Redis, move strlen to ouside of a for

[eduardosoliv]

A diff can be seen here: https://github.com/entering/php-resque/commit/279499585426f1147bbd81ce82c5cd9fb1ef9390.diff

[chrisboulton]

Thanks for this - I've actually just externalized the Redis handling (we're now using Credis instead of Redisent, and it's installed from the official maintainer via Composer - https://www.github.com/colinmollenhour/credis).

It looks like Credis could do with the same optimization, so it could be submitted upstream. 👍

[eduardosoliv]

Done: colinmollenhour/credis#6