关于Mysql和gd 库加载问题
我们安装的mysql 和php 通过什么之间进行连接，，还有为什么我们没有安装gd库而只须打开gd库就能使用它，，，，为什么一个需要安装一个不需要安装，，区别在哪；；求解想不通啊；
------解决方案--------------------
mysql是一个数据库系统，它也可以和.Net, java等其它编程语言接通，它是通过socket通信协议和外界交流。
而php安装包中自带了GD库扩展，以及连接mysql数据库的扩展（如mysql, mysqli, pdo_mysql)等等，但默认都是没有启用。
------解决方案--------------------
都是通过扩展的,mysql 是个数据库，如果php不将mysql的支持扩展打开的话也是不支持的。所以扩展和数据库mysql你可能要分清楚。gd也是一个扩展这些扩展默认都已经在php的发行包里，所以我们一般只需要打开支持就可以了.
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