判断文件是否存在

@@ -345,6 +345,13 @@ class Vip extends Api
         if (empty($url)) {
             $this->error('参数不能为空！', '', '7');
         }
+        $is_invite_code = 'images/invite_' . $user_id['id'] . '_code.png';
+        if (file_exists($is_invite_code) == true) {
+            $return = [
+                'url' => $url . '/images/invite_' . $user_id['id'] . '_code.png'
+            ];
+            $this->success('成功', $return);
+        }
         $model = new \app\common\model\User();
         $name = $model::get(['user_id' => $user_id['id']]);
         $time = time();