FrontendUser::login() 

\nn\t3::FrontendUser()->login($username, $password = NULL); 

Log in user manually. from v10: Alias to \nn\t3::FrontendUserAuthentication()->loginByUsername( $username );

\nn\t3::FrontendUser()->login('99grad');
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@param $username
@param $password @throws ReflectionException

Source Code 

public function login( $username, $password = null )
{
	if ($password !== null) {
		die('Please use \nn\t3::FrontendUserAuthentication()->login()');
	}
	$user = \nn\t3::FrontendUserAuthentication()->loginByUsername( $username );
	return $user ?: [];
}
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