zendframework使用上的遇到的问题

Uncaught exception 'Zend_Db_Adapter_Exception' with message 'The PDO extension is required for this adapter but not loaded' in d:\mysite\zendframework\libs\Zend\Db\Adapter\Pdo\Abstract.php:95 Stack trace: #0 d:\mysite\zendframework\libs\Zend\Db\Adapter\Abstract.php(246): Zend_Db_Adapter_Pdo_Abstract->_connect() #1 d:\mysite\zendframework\libs\Zend\Db\Adapter\Pdo\Abstract.php(206): Zend_Db_Adapter_Abstract->query('DESCRIBE `album…', Array) #2 d:\mysite\zendframework\libs\Zend\Db\Adapter\Pdo\Mysql.php(108): Zend_Db_Adapter_Pdo_Abstract->query('DESCRIBE `album…') #3 d:\mysite\zendframework\libs\Zend\Db\Table\Abstract.php(595): Zend_Db_Adapter_Pdo_Mysql->describeTable('album', NULL) #4 d:\mysite\zendframework\libs\Zend\Db\Table\Abstract.php(528): Zend_Db_Table_Abstract->_setupMetadata() #5 d:\mysite\zendframework\libs\Zend\Db\Table\Abstract.php(264): Zend_Db_Table_Abstract->_setup() #6
应该是没有加载php的pdo模块
php.ini里面
extension=php_pdo.dll
extension=php_pdo_mysql.dll