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Function Reference/get user id from string

Description

Get a numeric user ID from either an email address or a login. If a number is sent to the function, that number is returned as the id.

Usage

<?php get_user_id_from_string$string ); ?>

Parameters

$string
(string) (required) String representation of the user to lookup the ID for. May be either the user's login (their username), or the email address registered in WordPress. A numeric string is considered to be an existing user ID and is simply returned as such.
Default: None

Return Values

(int) 
ID of the user specified by $string on success, null if no user is found.

Source File

get_user_id_from_string() is located in wp-includes/ms-functions.php