My question is: Have a better way to do this? or best pratice to get the user on this function? thanks!

  1. function customized_node_submitted($node) {
  2.   $user = user_load(array('name'=>$node->name));
  3.  
  4.   return t('Submitted by !username on @datetime',
  5.     array(
  6.       '!username' => $user->profile_full_name,
  7.       '@datetime' => format_date($node->created),
  8.     ));
  9. }