public function modify()
 {
     $this->checkLogin();
     $User = new UserModel();
     $user['US_id'] = session('userid');
     if (strlen($_POST['US_name']) != 0) {
         $user['US_name'] = $_POST['US_name'];
     }
     if (strlen($_POST['US_sex']) != 0) {
         $user['US_sex'] = $_POST['US_sex'];
     }
     if (strlen($_POST['US_birth']) != 0) {
         $user['US_birth'] = $_POST['US_birth'];
     }
     if (strlen($_POST['US_face']) != 0) {
         $user['US_face'] = $_POST['US_face'];
     }
     if (strlen($_POST['US_highest']) != 0) {
         $user['US_highest'] = $_POST['US_highest'];
     }
     if (strlen($_POST['US_major']) != 0) {
         $user['US_major'] = $_POST['US_major'];
     }
     if (strlen($_FILES['US_image']['name'][0]) == 0) {
         $status = $User->modifyUser($user);
         if ($status) {
             $this->success('上传成功!', 'personCenter');
         } else {
             $this->error('修改失败!');
         }
     } else {
         $upload = new \Think\Upload();
         // 实例化上传类
         $user['US_image'] = '/zhaoping/Public/Common/User/' . $_FILES['US_image']['name'][0];
         $upload->maxSize = 3145728;
         // 设置附件上传大小
         $upload->exts = array('jpg', 'gif', 'png', 'jpeg');
         // 设置附件上传类型
         $upload->rootPath = './Public/Common/User/';
         // 设置附件上传根目录
         $upload->savePath = '';
         // 设置附件上传目录
         $oldImage = $User->getUserInfo($user['US_id'])[0];
         $path = '.' . substr($oldImage['US_image'], 9, 200);
         $info = $upload->upload();
         if (!$info) {
             // 上传错误提示错误信息
             $this->error($upload->getError());
         } else {
             // 上传成功
             //删除旧的图片
             if (strcmp($oldImage, $user['US_image']) != 0) {
                 if (file_exists($path)) {
                     unlink($path);
                 }
             }
             //添上新图
             $User->modifyUser($user);
             $image = new \Think\Image();
             $image->open($path);
             //将图片裁剪为120*160并保存为corp.jpg
             $image->thumb(120, 160, \Think\Image::IMAGE_THUMB_FIXED)->save($path);
             $this->success('上传成功!');
         }
     }
 }