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mysql 发不了一个MySQL native driver for PHP - mysqlnd来替代php5/php6中自带的mysqli模块，该模块可以在这里下载到：

• Download php_mysqli.dll for PHP 5.2.1 (Windows)


• Download source code (tar.gz)


• SVN repository: http://svn.mysql.com/svnpublic/php-mysqlnd/


• SVN Web Interface: http://svn.mysql.com/fisheye/browse/php-mysqlnd

安装方法是用该模块替换原来的mysqli模块，或者编译php之前，将ext/mysqli目录替换掉，然后在php源代码根目录执行：buildconf --force
编译的时候加上 --with-mysqli --enable-mysqlnd即可。

官方描述的这个模块的主要优点是：

On the C-level mysqlnd uses many of the proven and stable PHP internal functions. All the code of the new driver is contained in the ext/mysqli source directory. There is no need to link any external libraries. Thus you neither need to install the MySQL client library to compile PHP with ext/mysqli support nor do you need to take care of versions. Compiling has been made easier.

mysqlnd使用了很多底层的php函数，所有最新的驱动都包含在内，编译的时候不需要再额外关联其他的库。所以编译php的时候不需要先装mysql，也不需要关心mysql版本。编译极大的简化。

并且mysqlnd的性能有很好的改善，也修复了一些原有bug，比如

• improved persistent connections


• mysqli_fetch_all()


• performance statistics call: mysqli_get_cache_stats(), mysqli_get_client_stats(), mysqli_get_connection_stats()