email_exists()
Function: Determines whether the given email exists.
Source: wp-includes/user.php:1986
validate_username()
Function: Checks whether a username is valid.
Source: wp-includes/user.php:2015
get_users()
Function: Retrieves list of users matching criteria.
Source: wp-includes/user.php:790
get_blogs_of_user()
Function: Gets the sites a user belongs to.
Source: wp-includes/user.php:950
is_user_member_of_blog()
Function: Finds out whether a user is a member of a given blog.
Source: wp-includes/user.php:1078
add_user_meta()
Function: Adds meta data to a user.
Source: wp-includes/user.php:1145
delete_user_meta()
Function: Removes metadata matching criteria from a user.
Source: wp-includes/user.php:1167
get_user_meta()
Function: Retrieves user meta field for a user.
Source: wp-includes/user.php:1189
update_user_meta()
Function: Updates user meta field based on user ID.
Source: wp-includes/user.php:1215
count_users()
Function: Counts number of users who have each of the user roles.
Source: wp-includes/user.php:1243