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register_sidebars

Creates multiple sidebars.If you wanted to quickly create multiple sidebars for a theme or internally. This function will allow you to do so. If you don’t pass the ‘name’ and/or ‘id’ in $args, then they will be built for you.

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register_sidebar

Builds the definition for a single sidebar and returns the ID.The $args parameter takes either a string or an array with ‘name’ and ‘id’ contained in either usage. It will be noted that the values will be applied to all sidebars, so if creating more than one, it will be advised to allow for WordPress to create the defaults for you.

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is_active_widget

Whether widget is displayed on the front-end.Either $callback or $id_base can be used $id_base is the first argument when extending WP_Widget class Without the optional $widget_id parameter, returns the ID of the first sidebar in which the first instance of the widget with the given callback or $id_base is found. With the $widget_id parameter, returns the ID of the sidebar where the widget with that callback/$id_base AND that ID is found.

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