is_registered_sidebar()

[GaryJ]

is_active_sidebar() looks at whether a sidebar has any widgets in it, but there doesn't seem to be a function that purely checks to see if a sidebar is still registered within the $wp_registered_sidebars global, irrespective of whether it would have any widgets in it or not.

[GaryJ]

Adds is_registered_sidebar() to compliment register_sidebar() and unregister_sidebar().

[nathanrice]

+1

[wpsmith]

+1

[wonderboymusic]

In 35102:

Widgets: add a function, is_registered_sidebar() - helps us avoid touching the $wp_registered_sidebars global.

Props GaryJ, wonderboymusic.
Fixes #24878.

[DrewAPicture]

In 35104:

Widgets: Rename the $name parameter in is_registered_sidebar() to $sidebar_id and adjust the accepted types to string|int as sidebar IDs can be numeric.

See #24878.