modify

System/Core/Str.php

@@ -266,4 +266,17 @@ class Str
         return preg_replace('/(\w{10})(\w{3})(\w{4})(\w{9})(\w{6})/', '$1-$2-$3-$4-$5', $md5);
     }
 
+
+    /**
+     * @param int $userId
+     * @return string
+     */
+    public static function getNo(int $userId)
+    {
+        $explode = explode(' ', str_replace('0.', '', microtime()));
+
+        return 'No.' . sprintf('%09d', $userId) . '.' . date('YmdHis') . '.' . current($explode);
+    }
+
+
 }