系統預設顯示更新訊息，可於設定檔中關閉。但 show_upgrade_warning = On 才不會顯示。
[root@csie5 ojs-ijait]# grep show_upgrade_warning -B1 config.inc.php
; Display a message on the site admin and journal manager user home pages if there is an upgrade available
show_upgrade_warning = On
