小蚂蚁学习PHP性能优化（1）
因为sphinx还没有找到比较合适的材料，今天开始学习一下PHP性能优化。记得很久之前做过这么一个功能，就是计算一级人脉下的所有推荐人的资金和，以及每个推荐人的推荐人的资金和，就形成了一个人脉树，当时的做法就是用了递归的方法来计算，其中不停的查询数据库，资源消耗相当的大，当一个人下面的直接推荐人和间接推荐人达到一二百个的时候，那就无法运行下去，这确实让人头疼了很久。今天开始学习一下高手讲解的PHP就很有必要。
PHP的性能问题的解决方法
PHP语言级的性能优化
PHP周边问题的性能优化
PHP语言自身分析优化
压力测试工具
Apache Benchmark（AB）
简介：AB是有Apache提供的压力测试软件
使用： ./ab -n1000 -c100 http://www.sina.com
-n 请求数 -c并发数 url目标压力测试地址
这句命令运行后，主要看两个参数：
requests per second 101.65ms (每秒可以接受几个请求) 这个值尽可能的高
time per request 9.838ms (一个请求耗时) 该值尽可能的小
PHP语言级性能优化
1. 优化点：少些代码，多用PHP自身的能力
性能问题：自写代码冗余较多，可读性不强，性能低下。
为什么性能低？PHP代码需要编译解析为底层语言，这一过程每次请求都会处理一遍，开销大
好的方法：多使用PHP内置变量，常量，函数。
2. 优化点：PHP内置函数的性能优劣
情况描述：PHP内置函数，之间依然存在快慢差异
好的建议：多去了解PHP内置函数的时间复杂度。
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