php pdo_mysql未安装问题解决方法
未安装pdo_mysql使用时会提示pdo_mysql 必须支持 请检查 pdo_mysql 模块是否正确加载了，安装方法很简单下面我来看看。
解决方法：
1.修改本地php.ini配置，以Win下的php.ini为例，找到
;extension=php_pdo_mysql.dll
;extension=php_pdo.dll
去除前面的分号“;”
2.重启apache服务即可。
可能碰到问题
建立Apache + Php + mysql + Zend 环境结果遇到一个问题，使用 pdo_mysql.dll 会报错 IE 就会出错 ，原来只要将 libmysql.dll 拷贝到 apache 目录下就可以了
将下载下来的php-5.2-win32-VC6-x86-latest.zip 解压取出其中中的libmysql.dll 扩展库拷贝到 xamppapachebin 和xamppphp目录下去覆盖原文件 重启 apache
当用php_pdo_mysql.dll扩展库链接数据库，发现IE页面突然出错自动关闭
点击调试 出现信息如下
szAppVer : 2.2.11.0 szModName : php_pdo_mysql.dll
szModVer : 5.2.8.8 offset : 0000250a
--with-mm 出现问题 configure: error: cannot find mm library ，将mm装在非 /usr下能够解决
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