WordPress Version: 4.6
/**
* Retrieve user info by login name.
*
* @since 0.71
* @deprecated 3.3.0 Use get_user_by()
* @see get_user_by()
*
* @param string $user_login User's username
* @return bool|object False on failure, User DB row object
*/
function get_userdatabylogin($user_login)
{
_deprecated_function(__FUNCTION__, '3.3.0', "get_user_by('login')");
return get_user_by('login', $user_login);
}