需掌握：PHP原理 Mysql底层 NGINX Linux Redis TCP/IP HTTP 数据结构 算法 设计模式 架构 安全
Mysql 锁机制
http://blog.csdn.net/soonfly/article/details/70238902
MySQL索引背后的数据结构及算法原理
http://blog.codinglabs.org/articles/theory-of-mysql-index.html
php底层原理
http://www.cunmou.com/phpbook/1.md
https://segmentfault.com/a/1190000006725176
http://blog.csdn.net/ty_hf/article/details/51057954
https://www.csdn.net/article/1970-01-01/2825720
IO复用原理
http://rango.swoole.com/archives/508
https://segmentfault.com/a/1190000007614502
TCP/IP详解
http://blog.csdn.net/goodboy1881/article/category/204448