從 3.0.5 升級到 3.0.6

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：更新 index.php 檔案 (選擇性的)

We’ve made some tweaks to the index.php file, mostly related to proper usage of directory separators (i.e. use the DIRECTORY_SEPARATOR constant instead of a hard coded forward slash “/”).

Nothing will break if you skip this step, but if you’re running Windows or just want to be up to date with every change - we do recommend that you update your index.php file.

Tip: Just copy the ``ENVIRONMENT``, ``$system_path``, ``$application_folder`` and ``$view_folder`` declarations from the old file and put them into the new one, replacing the defaults.

步驟 3：移除 ‘prep_for_form’ 的使用 (強烈建議)

The Form Validation Library has a prep_for_form() method, which is/can also be used as a rule in set_rules() to automatically perform HTML encoding on input data.

Automatically encoding input (instead of output) data is a bad practice in the first place, and CodeIgniter and PHP itself offer other alternatives to this method anyway. For example, Form Helper functions will automatically perform HTML escaping when necessary.

因此， prep_for_form 模組/規則 幾乎是沒有用處的，並將於 3.1 之後的版本將其移除。