A PHP Error was encountered

Severity: Notice

Message: Undefined variable: browser

Filename: libraries/CommonUtils.php

Line Number: 68

Backtrace:

File: /data/wwwroot/www.yinheyuedu.com/application/libraries/CommonUtils.php
Line: 68
Function: _error_handler

File: /data/wwwroot/www.yinheyuedu.com/application/controllers/Book.php
Line: 167
Function: common

File: /data/wwwroot/www.yinheyuedu.com/index.php
Line: 315
Function: require_once