WP_User $profile_user )
Fires after the ‘About the User’ settings table on the ‘Edit User’ screen.
This action hook is typically used to output new fields or data to the bottom of WordPress’s user profile pages.
This hook only triggers when a user is viewing another users profile page (not their own). If you want to apply your hook to ALL profile pages (including the current user) then you also need to use the show_user_profile hook.
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do_action( 'edit_user_profile', $profile_user );