Widgets in PHP files?

If the 12 elements are static HTML, you can just create 12 text widgets.

If they’re not, it depends on what you mean by “easy to manage”. I, for one, prefer to be able to easily manage my code via SVN. Using widgets obscures that.

If you just want them to be in separate files, just make separate files, put them in their own folder and include them:

include './sidebar/part-1.php';
include './sidebar/part-2.php';

If you’re sure you really want widgets, wrap the code in the files mentioned previously in classes, as described here:

http://codex.wordpress.org/Widgets_API#Developing_Widgets

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