February 12, 2011 
Definition:
function get_user_id_from_string( $string ) {}
Get a numeric user ID from either an email address or a login.
Parameters
- string $string
Source code
function get_user_id_from_string( $string ) {
$user_id = 0;
if ( is_email( $string ) ) {
$user = get_user_by('email', $string);
if ( $user )
$user_id = $user->ID;
} elseif ( is_numeric( $string ) ) {
$user_id = $string;
} else {
$user = get_user_by('login', $string);
if ( $user )
$user_id = $user->ID;
}
return $user_id;
}
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