Registers all of the default WordPress widgets on startup.

Fires before a widget’s display callback is called.

Fires after widgets are rendered in a dynamic sidebar.

Fires before widgets are rendered in a dynamic sidebar.

Filters whether a sidebar has widgets.

Filters the parameters passed to a widget’s display callback.

Filters whether a dynamic sidebar is considered “active”.

Fires once a sidebar has been registered.

Filters the sidebar default arguments.

Filters the list of sidebars and their widgets.