检查已安装的驱动程序，并查看是否已安装oci:

Check your installed drivers and see if oci is installed:

foreach(PDO::getAvailableDrivers() as $driver)
    echo $driver, '\n';

如果未显示oci，则需要安装它( http ://php.net/manual/en/ref.pdo-oci.php )

If oci don't shown, then need to install it (http://php.net/manual/en/ref.pdo-oci.php)