redis php 秒殺

https://segmentfault.com/q/1010000000577607

https://segmentfault.com/q/1010000003035656

https://segmentfault.com/q/1010000007165163

https://segmentfault.com/q/1010000002407792

http://www.jb51.net/article/30093.htm

http://www.csdn.net/article/2014-11-28/2822858