joomla user id in condition list of ccv5

I apreciate i someone can help
i need insert a condition in ccv5 form that show only records of table that allow to one user
I did it statically with

<?php
 return array(
   "nif" =>"12",
  "nombre" =>"88"
 );
 ?>

But my purpose is do it dinamically with user id of joomla, but I don't know how can i get it from enviroment of joomla
regards

Hi teldrive,

Please see this FAQ

Bob

Hi Bob , thanks by reply, i am untrained in CCv5,

but I have tried with this in order to debug it

<?php
$user = & JFactory::getUser();
$login=$user->username;

print "-> $login  es el username   ";
print "-> $user   es el array    ";

 /*return array('nif' =>$user->name);*/

 return array('nif' =>"seden");
 ?>

the results are:
no value for $login
$user value = JUser

and list works because "seden· is constant, so can you help me, what am I missing?

Sorry Bob is working😀
is working, my failure was that I have to register as user to get it works, because from backend there is not registered users

here is the screen