add_user_to_blog()
Function: Adds a user to a blog, along with specifying the user’s role.
Source: wp-includes/ms-functions.php:152
Function: Adds a user to a blog, along with specifying the user’s role.
Source: wp-includes/ms-functions.php:152
Filter Hook: Filters whether a user should be added to a site.
Source: wp-includes/ms-functions.php:173