Returns the number of active users in your installation.

Retrieves user meta field for a user.

Retrieves user option that can be either per Site or per Network.

Retrieves list of users matching criteria.

Finds out whether a user is a member of a given blog.

Adds an admin notice alerting the user to check for confirmation request email after email address change.

Handles registering a new user.

Handles resetting the user’s password.

Handles sending a password retrieval email to a user.

Sanitizes user field based on context.