PHP 多进程开发
pcntl_fork();
https://blog.csdn.net/wujiangwei567/article/details/77006724
https://blog.csdn.net/qq_32439101/article/details/79522682
https://blog.csdn.net/yangyang_01/article/details/80372557
http://www.laruence.com/2009/06/11/930.html