diff --git a/Application/Common/Common/function.php b/Application/Common/Common/function.php
index c87284739..a2c806fe8 100644
--- a/Application/Common/Common/function.php
+++ b/Application/Common/Common/function.php
@@ -61,7 +61,7 @@ function str2arr($str, $glue = ',')
  * @return string
  * @author 麦当苗儿 <zuojiazi@vip.qq.com>
  */
-function arr2str($arr, $glue = ',')
+function arr2str($arr=[], $glue = ',')
 {
     return implode($glue, $arr);
 }