A PHP Error was encountered

Severity: Notice

Message: Undefined variable: cur

Filename: views/study_detail.php

Line Number: 21

Backtrace:

File: /www/wwwroot/zhixue.org/application/views/study_detail.php
Line: 21
Function: _error_handler

File: /www/wwwroot/zhixue.org/application/controllers/Home.php
Line: 325
Function: view

File: /www/wwwroot/zhixue.org/public/index.php
Line: 318
Function: require_once