apply_filters( ‘is_active_sidebar’, bool $is_active_sidebar, int|string $index )

Filters whether a dynamic sidebar is considered “active”.

Parameters

$is_active_sidebarbool: Whether or not the sidebar should be considered "active".
In other words, whether the sidebar contains any widgets.
$indexint|string: Index, name, or ID of the dynamic sidebar.

return apply_filters( 'is_active_sidebar', $is_active_sidebar, $index );

Used by	Description
is_active_sidebar()`wp-includes/widgets.php`	Determines whether a sidebar contains widgets.

Version	Description
3.9.0	Introduced.

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