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thinkphp prevents users from logging in on different devices

WBOY
WBOYOriginal
2016-09-08 08:29:381226browse

Tried to use Session but failed

code

<code>      if($username==session('user')){
            $data['error'] ="您的账号已登录，请勿重复登录！";
             
            $this->ajaxReturn($data);
       }</code>
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