apply_filters( 'can_add_user_to_blog', bool|WP_Error $retval, int $user_id, string $role, int $blog_id )

Filters whether a user should be added to a site.

Parameters

$retval: True if the user should be added to the site, false or error object otherwise.
$user_id: User ID.
$role: User role.
$blog_id: Site ID.

Used By
Used By	Description
wp-includes/ms-functions.php: add_user_to_blog()	Adds a user to a blog.

Changelog
Version	Description
WP-4.9.0	Introduced.