点击系统托盘上的WAMPServer图标，然后点击PHP项下的php.ini.接下来找到这一行:

Click WAMPServer icon on system tray then click php.ini under PHP item. next find this lines:

;extension=pdo_mysql
;extension=mysqli

并将它们更改为这些:

extension=pdo_mysql
extension=mysqli

然后在 WampServer 菜单中点击重新启动所有服务

Then click on Restart All Services in WampServer menu