PDO drivers no value in Windows

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學習php編程遇到 

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

或者 

Undefined class constant ‘MYSQL_ATTR_INIT_COMMAND‘

整兩個問題,網上找了很多資料,很多是這樣解決的

配置php.ini檔案添加extension=php_pdo_mysql.dll，這樣就開啟pdomysql擴充庫 

但是我沒有解決問題,問題還是老樣子,後來在stackoverflow 找到了問題所在

具體連結http://stackoverflow.com/questions/7086859/pdo-drivers-no-value-in-windows

問題出在了

extension_dir = "ext"

改成絕對路徑就可以了

; 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 and php -m was 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 the extension_dir to an absolute path. I‘m guessing it got confused when running through Apache and made it relative to something else.　　

我固定它通過改變extension_dir絕對路徑。我猜它混淆了運行時通過Apache和相對於別的東西。

轉載：http://blog.csdn.net/bao0682/article/details/46827111

PDO drivers no value in Windows