oop - search php object for empty value -

looking best way accomplish below. want return true if empty in user object, don't care 1 empty. think i've done before searching empty values in array can't think of best way objects.

i know can loop thru object , break once find empty value in object, checking first see if there better way of doing this, thanks!

function is_it_empty($user) {  $is_it_empty = false;  if( isset($user->first_name) )    $is_it_empty = true;   if( isset($user->last_name) )    $is_it_empty = true;   return $is_it_empty; } 

also:

function name($user) {  foreach($user $u):    if( isset ($user->value) ): // or should isset?       return true;       break;    endif;  endforeach;   return true; } 

$user = new stdclass(); $user->firstname = 'mark'; $user->lastname = 'baker'; $user->sanity = null;  function is_it_empty($user) {     foreach($user $property) {         if (empty($property)) {             return true;         }     }     return false; }  var_dump(is_it_empty($user));