• redis: phpredis in phpredis

• 使用第三方工具：guzzle

> ./checkstyle.sh - to check the code style and static check.
> ./runutest.sh - to utest all testcases.

居中格式: $$xxx$$ $$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$ 靠左格式: \(xxx\) \(x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\) 测试 $$\frac{7x+5}{1+y^2}$$ \(l(x_i) = - \log_2 P(x_i)\)