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WPMU Functions/wpmu signup user

Stores the new users details in the database and calls wpmu_signup_user_notification to email the new user an activation link.

$user

(string) (required) The new user's username.

Default: None

$user_email

(string) (required) The new users' email address.

Default: None}

$meta

(object) (optional) Other meta information.

Default: [blank string]

<?php wpmu_signup_user($user, $user_email, $meta); ?>

wpmu_signup_blog does the same thing except that it also stores details of the new blog registered.

wpmu_signup_user_notification sends an activation email to new users after they have completed the signup process, it includes their activation link.