mysqlnd是什么？
Mysql Native驱动(Mysql Native Driver 简称:mysqlnd )在PHP5.3.0版本中被引入。PHP5.4之后的版本mysqlnd被作为默认配置选项。 由zend 公司开发的MySQL数据库驱动，采用PHP开源协议（即 PHP license）避免了任何可能存在的版权问题。而旧的libmysql是有Mysql AB公司（现在的Oracle Corporation）开发，依照mysql license。它是新的函数库，libmysql有的功能它几乎都有，但是mysqlnd并不像libmysql那样作为通用库，它是专门为PHP而写的一个库，用了PHP的内在管理函数以及一些网络流的函数。
MySQLnd成为php 5.4中的默认mysql驱动，它有如下优点：
1、mysqlnd更容易编译； 因为它是php源码树的一个组成部分
2、mysqlnd和php内部机制结合更紧密，是优化过的mysql驱动
3、mysqlnd更节省内存，从测试结果来看，比传统的mysql扩展节省40%的内存
4、mysqlnd更快
5、mysqlnd提供了丰富的性能统计功能
6、mysqlnd使用了PHP license以避免不必要的版权纠纷
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