How do I access custom field value from my own extension?

When user is logged in, his extra information (custom field values) is attached to his user object. You can access it like:

$user = JFactory::getUser();
print_r($user->extra);

For example, to access your field with label companyName you will do it with:

$user->extra['companyName'];

If you want to get extra info for different users (other than the logged in one) you can do something like this:

$user = JFactory::getUser($userid);
plgSystemAJAXRegister::attachExtraFields($user);
print_r($user->extra);

Frequently Asked Questions (FAQ)