can_add_user_to_blog

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Filters whether a user should be added to a site.

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

$retval: (bool|WP_Error) True if the user should be added to the site, false or error object otherwise.
$user_id: (int) User ID.
$role: (string) User role.
$blog_id: (int) Site ID.

Changelog
Version	Description
4.9.0	Introduced.