Widget overview
Even if you are already familiar with widgets, take a moment to look at how they work in the WordPress manager under Appearance | Widgets. You know that they display content on the frontend of your site, usually in a sidebar, and they also have text and control forms that are displayed only when you view them inside the manager. If you put on your thinking cap, this should suggest to you at least two actions: an action that displays the content on the frontend, and an action that displays the form used to update the widget settings inside the manager. There are actually a total of four actions that determine the behavior of a standard widget, and you can think of these functions as a unit because they all live together in a single ...
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