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
count_many_users_posts()
Function: Gets the number of posts written by a list of users.
Source: wp-includes/user.php:619
get_current_user_id()
Function: Gets the current user’s ID.
Source: wp-includes/user.php:655
get_user_option()
Function: Retrieves user option that can be either per Site or per Network.
Source: wp-includes/user.php:682
wp_signon()
Function: Authenticates and logs a user in with ‘remember’ capability.
Source: wp-includes/user.php:40
wp_authenticate_username_password()
Function: Authenticates a user, confirming the username and password are valid.
Source: wp-includes/user.php:135
wp_authenticate_email_password()
Function: Authenticates a user using the email and password.
Source: wp-includes/user.php:219
wp_authenticate_cookie()
Function: Authenticates the user using the WordPress auth cookie.
Source: wp-includes/user.php:298
wp_authenticate_spam_check()
Function: For Multisite blogs, checks if the authenticated user has been marked as a spammer, or if the user’s primary blog has been marked as spam.
Source: wp-includes/user.php:524