重复定义问题

 Fatal error: Cannot redeclare smarty_funciton_test() (previously declared in C:\wamp\www\mvcstudy\smarty\plugins\function.test.php:3) in C:\wamp\www\mvcstudy\smarty\plugins\function.test.php on line 13

这个是哪出错了？我是按照老师的步奏敲的代码