fix bug

apps/exams/Lib/Action/AdminPaperAction.class.php

@@ -313,7 +313,7 @@ class AdminPaperAction extends AdministratorAction
             $data['is_rand']           = isset($_POST['is_rand']) ? intval($_POST['is_rand']) : 0;
             $data['assembly_type']     = isset($_POST['assembly_type']) ? intval($_POST['assembly_type']) : 0;
             $data['best']              = isset($_POST['best']) ? intval($_POST['best']) : 0;
-            $data['attache']           = $attache_id;
+            $data['attache']           = (string)$attache_id;
             $data['price']             = t($_POST['price']);
             if (M('exams_paper')->where(['exams_paper_id' => $paper_id])->save($data)) {
                 $this->success('编辑成功');