專為右欄複雜的內容和複雜的顯示設定而建立一個模組管理有幾個好處:

1. 返回NULL 便可以令系統跳過
很方便的就可以處理不顯示的狀態
先檢查顯示與否, 不顯示或權限不足便返回 NULL

2. 源碼管理軟件 (scm) 可以助管理
傳統的 add block 方法將block 內容和顯示的邏輯放到資料庫
不利於 scm 管理
而且使用文件的方式儲存代碼更加有更新容易, 除錯容易等等的優點
身為開發者, 而不是使用者, 有責任為網站提供一個更容易維護的環境

3. 避免將錯誤的PHP 放到資料庫
在顯示設定很多時候都會用到 PHP code
而錯誤的 syntax error 的 PHP code 放到資料庫,
會為頁面不能顯示, 也不可以使用 web 介面修改
要到資料庫中修改, 很麻煩

build a module only for complex blocks have several pros:
1. simple "do not display"
check the visability first,
just return nothing for empty blocks, or access denied cases
system will skip them.

2. Source control management (scm) can help
traditional "add block" method put block content and related visability settings in database
which do not fit with scm.
The use of a module file to store code promotes later updates, easier debugging
Also, as a developer, but not a user, there is a responsibility to provide a better maintainable environment.

3. avoid DB crash upon error php code in database
in visability, PHP is often used
and the syntax errored PHP code will also got stored, and crash the page.
You cannot correct it through web interface,
but have to open a database connection and edit them, very trouble