php 无法加载mysql的module的时候的配置的解决方案引发的思考_php技巧
之后看phpinfo() 里 确实也没找到mysql 模块， 之后所谓的解决方案如“将php.ini” 放入C:\Windows 环境变量等不靠谱说法。。。。。
甚至拷贝ext的文件夹的dll 到System32 中等
统统不靠谱 直到看到这篇帖子，我才发现问题
http://www.haosblog.com/index.php?mod=article_read&id=322
“mysql无法找到的原因是mysql的运行库无法找到，打开mysql的安装文件夹，在bin文件夹中找到libmySQL.dll，将它复制到system32文件夹中，让mysql的运行库能在系统中注册，然后重启Apache”
我是在MySQL\MySQL Server 5.5\lib目录里找到的
实际上在自己配置的时候应该发现不是环境变量或者是没有加载到php.ini 或者没加载到extension的
为什么这么说呢
首先，在Apache 的配置中 已经添加了php的配置路径
同时phpinfo()也显示的加载到了，有兴趣的同学可以试试php.ini 存在和不存在的时候的区别
其次，自己在php.ini里确实配置了extension_dir 的，如果这个东西没意义，那何必在配置文件里有这个选项？之后这里注意一下，他的分隔符和apache 刚好相反 是“”
之后php 也顺利加载了
所以，其实完全可以避免自己跟着瞎折腾的，结果大意了。
PHP配置成功后phpinfo中找不到mysql不少新人使用Apache+PHP+MySql配置好PHP环境都会遇到一个问题：mysql无法使用，使用phpinfo()函数获取的信息中也找不到mysql。
网上不少资料都说要把php.ini转移到windows或者system32文件夹中，这是胡扯！如果你把php和php/ext的目录添加到了环境变量中是不需要这么设置的。这么做的原因是Apache会到默认路径中查找配置文件，而没有设置环境变量的话Apache就找不到php.ini了。你可以看看phpinfo()页面中搜索php.ini，php.ini的路径是windows那么就把PHP的路径写入环境变量中，环境变量的设置可上网查找一下，尽量不要将php.ini放入系统文件夹中，对系统盘的操作要越少越好。
mysql无法找到的原因是mysql的运行库无法找到，打开mysql的安装文件夹，在bin文件夹中找到libmySQL.dll，将它复制到system32文件夹中，让mysql的运行库能在系统中注册，然后重启Apache，打开phpinfo()页面，搜索mysql，结果如下图
那么恭喜你，mysql已经能够正常在你的PHP中运行了。
不少新人都会被这个问题困扰，当初我也被它困扰了很久，网上的资料都是说把php.ini复制到系统盘，可是依然无用。这里严重BS一下那些没有实际行动只会复制别人文章的人，不少错误的信息就是被他们扩散，误导了不少新人，严重鄙视！
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