fix bug

app/common.php

@@ -8,19 +8,21 @@
 // +----------------------------------------------------------------------
 // 应用公共文件
 use app\model\Member;
+use think\facade\Request;
 use think\facade\Session;
+use think\facade\Config;
 
 /**
  *
  */
 function is_login() {
 	$user = Session::get('userInfo');
-	return $user['uid'];
+	return isset($user['uid']) ? $user['uid'] : false;
 }
 
 function is_administrator() {
 	$user = Session::get('userInfo');
-	return (int) $user['uid'] === (int) env('rootuid') ? true : false;
+	return (isset($user['uid']) && (int) $user['uid'] === (int) env('rootuid')) ? true : false;
 }
 
 function form($field = [], $data = []) {