gx文件验证问题

@@ -153,7 +153,7 @@ class FileManageController extends BaseController
         if($file->getSize()/1024/1024 > $this->upload_config['upload_max_size']){
             $this->fail('超出最大允许上传文件大小:'. $this->upload_config['upload_max_size'] .'M');
         }
-        $extension = $file->getClientOriginalExtension();
+        $extension = strtolower($file->getClientOriginalExtension());
         if(!in_array($extension, explode(',', $this->upload_config['allow_file_type']))){
             $this->fail('不允许上传的文件类型');
         }