wp-includes/ms-functions.php:2328Adds a newly created user to the appropriate blog
$user_idint$passwordstring$metaarrayfunction add_new_user_to_blog( $user_id, #[\SensitiveParameter] $password, $meta) { if ( ! empty( $meta['add_to_blog'] ) ) { $blog_id = $meta['add_to_blog']; $role = $meta['new_role']; remove_user_from_blog( $user_id, get_network()->site_id ); // Remove user from main blog. $result = add_user_to_blog( $blog_id, $user_id, $role ); if ( ! is_wp_error( $result ) ) { update_user_meta( $user_id, 'primary_blog', $blog_id ); } }}Introduced in MU (3.0.0). Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.