could not find driver 查看PHPINFO PDO中PDO drivers no value

PDO drivers no value in Windows，有需要的朋友可以参考下。

学习php编程遇到

Uncaught exception 'PDOException' with message 'could not find driver'

或者

Undefined class constant 'MYSQL_ATTR_INIT_COMMAND'

整两个问题,网上找了很多资料,很多是这样解决的

配置php.ini文件添加extension=php_pdo_mysql.dll，这样就开启pdomysql扩展库

但是我没有解决问题,问题还是老样子,后来在stackoverflow 找到了问题所在

问题出在了

extension_dir = "ext"

改成绝对路径就可以了

例如：

extension_dir = "D:/php-5.4.11-Win32-VC9-x86/ext"

; Directory in which the loadable extensions (modules) reside. ;http://php.net/extension-dir ; extension_dir = "./" ; On windows: extension_dir = "D:/php-5.4.11-Win32-VC9-x86/ext

原因

in php.ini andphp -mwas starting fine and reporting that it loaded pdo_mysql, but when I ran phpinfo.php through apache, the driver was missing.

I fixed it by changing theextension_dirto anabsolute path. I'm guessing it got confused when running through Apache and made it relative to something else.　　

我固定它通过改变extension_dir绝对路径。我猜它混淆了运行时通过Apache和相对于别的东西。