從 3.1.5 升級到 3.1.6

在執行升級之前，你應該更換 index.php 為靜態檔案，將網站導向此靜態網頁。

步驟 1：更新網站 CodeIgniter 檔案

取代 system/ 目錄打下的所有目錄與檔案

步驟 2: Remove usage of the APC Cache driver (deprecation)

The Cache Library APC driver is now deprecated, as the APC extension is effectively dead, as explained in its PHP Manual page.

If your application happens to be using it, you can switch to another cache driver, as APC support will be removed in a future CodeIgniter version.