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to display the user id i use this code

<?php
$user = JFactory::getUser();
$form->data['codiceca'] = $user->id;
?>

how can I change the code to display the user's group id?

thanks

Hello agostino87,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
How can I add a User to a User Group?
What decides if clientside validation is enabled?
P.S: I'm just an automated service😉

Hi agostino87,

In Joomla! 3 a user can belong to several groups - what do you actually need to show?

Bob