1. 检查php扩展库中是否存在php_pdo.dll（当调用MsSQL同时还需要php_pdo_mssql.dll；当调用MySQL同时还需要php_pdo_mysql.dll）.
2. 打开php.ini配置文件，加入:
指定扩展库
extension_dir="C:\Program Files (x86)\PHP\ext"
[PHP_PDO]
extension=php_pdo.dll
[PHP_PDO_MYSQL]
extension=php_pdo_mysql.dll
或
[PHP_PDO_MSSQL]
extension=php_pdo_mssql.dll
打开phpinfo发现多了pdo及对应扩展，OK下面可以PDO进行数据连接访问了 ~
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