enregistrement utilisateur afficher les donnees

$app = JFactory::getApplication();
$user = JRequest::getVar('main_user_data');

$options = array(
	'remember' => true,
	'return' => false
);
$credentials = array(
	'username' => $user['email'],
	'password' => $user['password']
);
$app->login($credentials, $options);

et je pouvais recuperer $user['name'] , $user['email'], $user['password']

$user = JRequest::getVar('data');
$register = $user['register'];
$address = $user['address'];

et $register['email'] ou $address['address_lastname']