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在钩子里面加载了session类在控制器里面 就加载了session提示是没有这个方法 
 在钩子里 $this->load->library('session')    把 用户的登录信息放在session 里面  在控制器里面想把session 里面用户的信息取出来   
$this->load->library("session"); 
$admin_info = $this->session->userdata('last_activity'); 
echo $admin_info; exit; 
结果提示 
A PHP Error was encountered 
Severity: Notice 
 
Message: Undefined property: Fz_goods: session 
 
Filename: controllers/fz_goods.php 
 
Line Number: 24 
 
 
Fatal error: Call to a member function userdata() on a non-object in E:\svn\wsyd\appl\controllers\fz_goods.php on line 24 
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